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WO1993019420A1 - Systeme d'acces a distance a des fichiers - Google Patents

Systeme d'acces a distance a des fichiers Download PDF

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Publication number
WO1993019420A1
WO1993019420A1 PCT/US1993/002652 US9302652W WO9319420A1 WO 1993019420 A1 WO1993019420 A1 WO 1993019420A1 US 9302652 W US9302652 W US 9302652W WO 9319420 A1 WO9319420 A1 WO 9319420A1
Authority
WO
WIPO (PCT)
Prior art keywords
file
computer
mass storage
base
storage device
Prior art date
Application number
PCT/US1993/002652
Other languages
English (en)
Inventor
David B. Folger
David R. Arnold
Adam S. Falk
Paul V. Fries
Maureen Lambert
Original Assignee
Nomadic Systems, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nomadic Systems, Inc. filed Critical Nomadic Systems, Inc.
Publication of WO1993019420A1 publication Critical patent/WO1993019420A1/fr

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10—File systems; File servers

Definitions

  • the present invention relates generally to the field of electronic data storage and retrieval means and more particularly to an improved system for providing access to data from a base computer or network to a remote computer.
  • data communications means b which computers can be caused to exchange data from remot locations.
  • modulator/demodulator ( ,, odem ,, ) devices are available to allow data to be sent betwee computers via telephone line interfaces.
  • all that is required to cause th desired transfer of data is to cause the receiving compute to be instructed to receive data via the modem, and to caus the sending computer to be instructed to send data via th modem.
  • Such instruction is generally accomplished by mean of software.
  • a difficulty with existing data exchange means is that, even if both a user's office computer and home computer are equipped to communicate together, there is no provision for ascertaining whether the information contained in a home computer is current as compared to that contained in the office computer. Unless the user can be certain that the information contained in the home or portable computer is current, there is no alternative except to "upload" the entire data files in question. Further, even when the user knows that the immediately available file differs from a more current version in a remote computer only in a few details, the only method available for obtaining those few changes is to upload the entire revised file. This can be both time consuming and costly, particularly if cellular phone transmission or long distance telephone transmission is utilized.
  • Varieties include straight forward file transfer programs which require the user to have immediate access to both the sending and receiving computers, and "communications" programs wherein a receiving computer is placed in a "ready” status to receive any incoming data that may be sent to it from a sending computer. More complex programs allow files to be "uploaded” from a base computer to remote computers, as requested by the remote computer.
  • LANs local area networks
  • the preferred embodiment of the present invention is a remote file access systems embodied within a computer system, said computer system having at least two computers which are located at remote locations relative to each other.
  • the remote file access system is adapted for allowing one of the computers to have access to the mass storage devices of the other, such that the first (local) computer can obtain files and/or file updates from the second (remote) computer, as required, in a manner which is relatively transparent to the user in that the user is required only to "call up" the file as though that file was residing, in its entirety, within his or her local computer.
  • the local computer provides the user with a complete listing of available files, as though all of those files were stored within the immediate mass storage devices of the local computer. When the user selects a file for use, the local computer first determines whether or not that file is stored within its own mass storage devices.
  • the remote computer is "called up" via modem, in the best presently known embodiment of the invention, and the remote computer is instructed to send the file to the local computer. If the local computer does have the required file in its mass storage, then the remote computer is contacted and requested to advise as to the most recent version of that file. If the most recent version is that which is stored within the local computer, no further action is required and the user can proceed to use that file. If the most recent version is other than that which is stored within the local computer, then a "delta file" having information pertaining to the differences between the most recent version and the locally available version is transmitted, and the local version is updated to conform to the most recent version.
  • An advantage of the present invention is that the use of computers having files which are stored and/or altered at a remote location is made more efficient.
  • a further advantage of the present invention is that a computer can automatically ascertain whether a version of a required file which is stored in its mass storage devices is the most recent iteration available.
  • Yet another advantage of the present invention is that the time and cost required to obtain an updated file from a distant computer are greatly reduced.
  • Still another advantage of the present invention is that efficiency of file management between remotely located computers and/or computer networks is greatly increased.
  • the files may be shared between computers with a minimum of user effort and cost.
  • Fig. 1 is a block schematic diagram of a computer system configured to embody the inventive remote file access system
  • Fig. 2 is a memory map depicting an example of the content of mass storage devices used in conjunction with the present invention
  • Fig. 3 is an updated version of the memory map of Fig. 2
  • Fig. 4 is an updated version of the memory map of Fig. 3.
  • the best presently known mode for carrying out the invention is a remote file access system for coordination of files among a plurality of computers.
  • the predominant expected usage of the inventive remote file access system is for providing access to the files of a "base" computer from a secondary computer, particularly wherein the secondary computer is a home or portable computer which is adjunct to the base computer such that an efficient means for accessing the files of the base computer from the secondary computer is desirable.
  • a computer system configured to embody the remote file access system of the presently preferred embodiment of the present invention is illustrated in a block schematic diagram in Fig. 1 and is designated therein by the general reference character 10.
  • the remote file access system 10 has a base computer 12 with a base computer mass storage device 14 and a branch computer 16 with a branch computer mass storage device 18.
  • the base computer 12 is equipped with a base computer modem 20 and the branch computer is equipped with a branch computer modem 22.
  • a data link 24 connects the base computer modem 20 to the branch computer modem 22.
  • the base computer 12 is an office desktop computer
  • the branch computer 16 is a laptop type portable computer which the user may employ, as required, at home or at some other location remote from the base computer 12.
  • the branch computer 16 may, alternatively, be a notebook type computer, a "full sized" home computer system, or the like.
  • the base computer mass storage device 14 and the branch computer mass storage device 18 are fixed rigid disk drive devices in the best presently known embodiment 10 of the present invention, since such devices are the predominant type of mass storage devices currently in use.
  • the present invention is not restricted to use with this, or any other, particular type of mass storage media, and other devices such as optical or magneto-optical mass storage devices could be employed for the purpose.
  • the base computer modem 20 and the branch computer modem 22 are conventional telephone modem devices
  • the data link 24 is conventional telephonic communications means.
  • the present invention is not restricted to use with such conventional means for exchanging data between the base computer 12 and the branch computer 16.
  • the data link 24 could be a conventional cellular telephone interconnection
  • the base compute modem 20 and the branch computer modem 22 adapted fo connection to that form of data link 24, or the data link 24 could be a local area network (“LAN”) .
  • LAN local area network
  • the present invention is no restricted to use with a single branch computer 16, and tha additional branch computers (not shown) could be employed, each functioning as does the branch computer 16 describe herein.
  • the base computer 12 could be a isolated conventional desk top computer, or the like.
  • the base computer 12 could be a part of a larger computer network (not shown) wherein the base computer 12, itself, has access to files from a network server (not shown) and or other computers within the network (not shown) . It should be noted that such alternative configurations of the base computer 12 and/or other elements of the remote file access system 10 are not expected to effect the operation of the best presently known embodiment 10 of the present invention. Figs.
  • FIGS. 2 through 4 are a series of memory maps 26 which are diagrammatic representations of the varying content of the mass storage devices 14 and 18, according to the best presently known embodiment 10 of the present invention.
  • the memory maps 26 of Figs. 2 through 4 are intended to illustrate the content, only, of the mass storage devices 14 and 18.
  • the memory maps 26 of Figs. 2 through 4 do not purport to represent a particular location in memory, or an amount of memory assigned to each of the elements shown therein.
  • Fig. 2 illustrates an exemplary memory map 26a representing contents of the mass storage devices 14 and 18 as might be encountered during the operation of the best presently known embodiment 10 of the present invention.
  • the base computer mass storage device 14 has a primary directory 28, and the branch computer mass storage device 18 has a secondary directory 30.
  • the primary directory 28 is a listing of file names 32 of a plurality (7 in the example of Fig.
  • the file names 32 are represented in the example of Fig. 2 by the nomenclature Nn, where n is 1 through 7, in the example of Fig. 2, corresponding to the seven files 34 (Fl through F7) presently written into the base computer mass storage device 1 .
  • Nn the nomenclature
  • the denominations Nl through N7 will actually be brief textual names and the files 34 will be comparatively lengthy data files, such as wor processor files or spreadsheet files.
  • file names 32 to files 34 within the base computer mass storage devic 14 is conventional in that there is a file name 32 in th primary directory 28 corresponding to each file 34 in th base computer mass storage device 14.
  • executable files programs
  • the presen inventive method could be extended to provide access t executable files. It will be evident in light of th discussion, hereinafter, that the content of two differen iterations of any particular file 34 may, or may not, b identical.
  • the secondary directory is placed in "virtual disk" (not shown) within the branch computer mas storage device 18.
  • the "virtual disk” is a conceptual devic well known to those skilled in the use of the DOS operatin system.
  • the "virtual disk” is a portion of the branc computer mass storage device 18 which is treated by DOS a thc'igh it were a physical drive distinct from the branc computer mass storage device, even though it is not.
  • the best presentl known embodiment 10 of the present invention redirects directory inquiry to this "virtual disk" through the mean conventionally available in DOS.
  • a file name 32 i selected from the secondary directory 30 the best presently known embodiment 10 of the present invention then causes the appropriate action to be taken, as will be described hereinafter.
  • the inventive remote file access system 10 can more easily be used in conjunction with existing software which is written such that it recognizes that files may be stored within various disks or "virtual disks". It should be noted that, in the example of Fig. 2, all of the files 32 are shown within the unitary primary directory 28 while, in practice, subdirectories (not shown) may be contained within the base computer mass storage device 14.
  • the example of Fig. 2 does not include subdirectories, as the invention is more clearly illustrated using the relatively simplistic memory map 26a of the example of Fig. 2.
  • the secondary directory 30, as depicted in the example of Fig. 2 is also a listing of file names 32, the content of which will be discussed hereinafter.
  • the branch computer mass storage device 18 also contains a plurality (3 in the example of Fig. 2) of files 34.
  • the base computer mass storage device also contains a primary version list 36, a remote file catalog 38 and a plurality (2 in the example of Fig. 2) of delta files 40.
  • the primary version list 36 has a plurality (3 in the example of Fig. 2) of primary version indicators 42 corresponding to the files 34 located in the base computer mass storage device 14, the primary version indicators 42 being shown in the example of Fig. 2 having the form "VFx,y", wherein x is the number of the file 34 which is being referenced and y represents a particular iteration or "version" of that file 34.
  • a certain "VF2.y" primary version indicator 42.2 in the example of Fig. 2 indicates that a corresponding "F2" file 34.2 having a corresponding "N2" file name 32.2 is in a second iteration (y---) - as presently stored on the base computer mass storage device.
  • the remote file catalog 38 allows the base computer 14 (Fig- 1) to know which files 34 are presently being held within the branch computer mass storage device 18 and, further, which iteration of such files 34 is being hel within the branch computer mass storage device 18. In the example of Fig.
  • the remote file catalog 38 contains three remote file listings 44, indicating that version 1 of a certain "Fl” file 34.1, version 1 of a certain "F5" file 34.5 and version 1 of a certain "F6" file 34.6 are presentl within the branch computer mass storage device 18. It shoul be noted that the content of the remote file catalog 38 i based upon a last previous communication between the bas computer 12 and the branch computer 16. If any modificatio of the content of the branch computer mass storage device 1 has occurred since such last previous communication, then th content of the remote file catalog 38 will not reflect th actual current status of the branch computer mass storag device 18. It should be noted that the method of the presen invention is not limited to use with a single branch compute 16 (Fig.
  • the remote file catalog 38 will have a remot file listing 44 corresponding to each file 34 contained i each of such branch computers 16, such that the base compute 12 (Fig. 1) can know which version of each file 34 i presently contained in each of the branch computers 16.
  • "state" files, such as th remote file listings 44 within the remote file catalog 38 can be a potential source of problems. In general, when the base computer 12 is required to keep track of the content of the branch computer mass storage device 18, then potential for error is introduced which may, or perhaps may not, outweigh the advantages of that feature.
  • the branch computer mass storage device 18 in addition to the files 34 and the secondary directory 30 listing of file names 32, the branch computer mass storage device 18 also contains a secondary version list 46 having therein a plurality (3 in the example of Fig. 2) of secondary version indicators 48 corresponding to the files 34 which are contained within the branch computer mass storage device 18. Therefore, if the content of the remote file catalog 38 within the base computer mass storage device 14 is current, the secondary version indicators 48 will be equal in number to, and will agree in substance as compared to, the remote file listings 44 in the base computer mass storage device 14.
  • the branch computer modem 20 when a user wishes to use the branch computer 16, the branch computer modem 20 must be connected to the data link 24 such that the branch computer 16 can access the base computer 12 therethrough.
  • the data link 24 may be conventional telephone lines, cellular telephone circuits, or the like. If the data link 24 to be used is a conventional telephone circuit, the user must physically connect the branch computer modem 22 to the data link 24 prior to the following described operations. In order to use the branch computer 16 the user, according to the present inventive method, is not required to perform operations differently than would be the case if the branch computer 16 were a stand alone computer having therein all data files required by the user.
  • the inventive method is performed by means of the hardware/software combination of the best presently known embodiment 10 of the invention, as described herein.
  • the branch computer 16 After being connected to the data link 24, the branch computer 16 is turned on according to the normal activation procedure for that device.
  • the user can cause the secondary directory 30 (Fig. 2) , or a portion thereof, to be displayed on the branch computer 16 by any of several actions. For example, when operating in a DOS environment, the user can enter a directory ("DIR") command. Alternatively, if operating in a Wi .ndowsT *11 environment, the file names 32 can be displayed as icons on the branch computer 16.
  • DIR directory
  • the file names 32 can be displayed as icons on the branch computer 16.
  • the display when running within an operations program, such as a word processor or a spreadsheet, the display may be regulated by that program such that only entries bearing a specified suffix are displayed and/or such that entries within a certain specified "path" are displayed, and the like.
  • the secondary directory 30 (or a portion thereof, as discussed above) will be displayed instead of the actual contents of the branch computer mass storage device 18.
  • a branch computer 16 (Fig. 1) display the secondary directory 30
  • the branch computer 16 will access the base computer 14 via the data link 24 to update the secondary directory 30 such that the secondary directory 30 will agree with the primary directory 28.
  • a first updated memory map 26b will, as shown in Fig. 3, -include the "N7" file name 32.7 in the secondary directory 30, as well as in the primary directory 28. Therefore, the user is alerted to the fact that the "F7" file 34.7 has been added to the base computer mass storage device 14, and is available for use.
  • inventive remote file access system 10 provides for the updating of files 34 at the branch computer 16 with delta files 40 which are created at the base computer 12, it is within the scope of the present invention that this process could be made bidirectional, with delta files 40 being created at the branch computer 16 and transmitted to the base computer 12 for updating the files 34 of the base computer 12 according to changes which may have been made at the branch computer 16.
  • the base computer 12 and the branch computer 16 could, if desired, be assigned an equal status, such that the base computer 12 and the branch computer 16 were not a "master” and "slave", as described herein.
  • the branch computer 16 accesses the base computer 12 via the data link 24 for the purpose of assuring that the "Fl" file 34.1, as stored within the branch computer mass storage device 18 is current with the "Fl" file 34.1 as stored within the base computer mass storage device 14.
  • the branch computer 16 accesses the base computer 12 via the data link 24 for the purpose of assuring that the "Fl” file 34.1, as stored within the branch computer mass storage device 18 is current with the "Fl” file 34.1 as stored within the base computer mass storage device 14.
  • the "Fl" file is retrieved from the branch computer mass storage device 18.
  • the branch computer 16 would access the base computer 12 via the data link 24, this time for the purpose of assuring that the "F5" file 34.5, as stored within the branch computer mass storage device 18 is current with the "F5" file 34.5 as stored withi the base computer mass storage device 14.
  • the first updated memory map 26b of Fig. the first updated memory map 26b of Fig.
  • a "DF5" delta file 40.5 containing any differences between the versions of the "F5" file, as found in " the base computer mass storage device 14, is transmitted via the data link 24 to the branch computer 16, and the branch computer mass storage device 18, and the "DF5" file 40.5 is integrated into the "F5" file 34.5 within the branch computer 16 such that the "F5" file 34.5 within the branch computer mass storage device 18 is updated to conform to that same "F5" file 34.5 within the base computer mass storage device 14.
  • the "DF" files 40 will be much smaller and easily transferred than the entire corresponding files 34.
  • a second updated memory map 26c, Fig. 4 depicts the content of the mass storage devices 14 and 18 following these operations.
  • the capacity of the branch computer mass storage device 18 will be substantially less than that of the base computer mass storage device 14, it might well occur that any of the operations described herei as being part of the inventive method will cause the impor of files 34 (or other data portions) from the base compute mass storage device 14 to the branch computer mass storag device 18 which operation might exceed the available (unused) capacity of the branch computer mass storage device 18. Fo this reason, the inventive method causes whichever file 3 within the branch computer mass storage device 18 which ha been least recently used to be deleted, as required, from th branch computer mass storage device 18 to make available room within the branch computer mass storage device 18 for the operations described herein.
  • the branch computer mass storage device 18 is acting as a "cache" for the content of the base computer mass storage device 14.
  • This method is known as a "least recently used” caching algorithm.
  • the present invention is certainly not limited to this particular algorithm, and any caching algorithm, presently known or yet to be invented, could be used in conjunction with the best presently known embodiment 10 of the present invention to perform the function of selecting files 34 to be deleted, as necessary, to create space in branch computer mass storage device 18.
  • conventional data compression is utilized for transmission of files 34 and delta files 44 via the data link 24 (Fig. 1) .
  • This condition is as might result from the "F6" file 34.6 having been revised twice since it was transmitted to the branch computer mass storage device 18.
  • a "DF6" file 40.6 within the base computer mass storage device 16 will contain all differences between version 1 of the "F6” file 34.6 and version 3 of that same file. It should be noted that at some intermediate stage there has been a version 2 of that same "F6" file 34.6 in existence and, at that time, the "DF6" file 40.6 would have contained differences between version 1 of the "F6” file 34.6 and version 2 of that same file.
  • One skilled in the art will recognize that it is a relatively simple matter to "merge" successive iterations of the delta files 40 such that cumulative differences between successive iterations of the files 34 may be contained therein, as required.
  • a new delta file 40 (or an updated version of an existing delta file 40, as required) is made each time a updated iteration of a file 34 is stored to the base computer mass storage device 16. It is recognized by the inventors that, depending upon the complexity of the files 34 and the processing speed of the base computer 12, this may be unduly time consuming in some applications, and it is within the scope of the present inventive method that alternative times and/or means for creation of the delta files 40 may be incorporated into the best presently known embodiment 10 of the present invention, as required by such peculiar circumstances. All of the above are only some of the examples of available embodiments of the present invention.
  • the remote file access system 10 is adapted to b widely used in conjunction with personal computers. Th predominant current usages are for applications wherein user has both an office computer and a secondary computer, the secondary computer usually being either a stationary hom computer system, or a portable computer. In such instances, it is customary for the user to want or need to use file which are primarily stored in the office computer when th user is away from the office. For example, the user may maintain a data base file of inventory in a portable computer when he or she is out taking orders. By means of the present invention, that file is automatically updated to the most recent iteration of the data base such that the user does not inadvertently sell something which has already been shown to have been removed from inventory in the office computer.
  • the inventive remote file access system 10 may be utilized in conjunction with either a single branch computer 12 or with a plurality of branch computers 12, as described herein.
  • the present invention is applicable to situations wherein a single user needs access to the files 34 or, alternatively, to situations wherein multiple users require access to the same set of files 34 from the base computer mass storage device 14.
  • the present inventive remote file access system 10 may be adapted for use with any operating system, known or yet to be invented. Furthermore, the present inventive remote file access system 10 might even be incorporated into future revisions of operating systems. Since the remote file access system 10 of the present invention may be readily constructed to operate using conventional prior art hardware components, it is expected that it will be acceptable in the industry as a substitute for conventional remote data retrieval means. Further, since the inventive remote file access system 10 does not require that a user learn new operating procedures, it is expected that the present invention will be welcomed as a substantial aid to productivity by computer users. For these and other reasons, it is expected that the utility and industrial applicability of the invention will be both significant in scope and long-lasting in duration.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Data Mining & Analysis (AREA)
  • Databases & Information Systems (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)

Abstract

Système amélioré (10) d'accès à distance à des fichiers comportant un ordinateur de base (12) et une mémoire de masse (14) d'ordinateur de base associée qui contient un répertoire primaire (28) qui est une liste de noms (32) de fichiers associés à des fichiers (34) stockés dans ladite mémoire, et au moins un ordinateur secondaire (16) en communication avec l'ordinateur de base (12) par l'intermédiaire d'une liaison de transmission de données (24), une mémoire de masse (18) étant associée audit ordinateur secondaire et contenant un répertoire secondaire (30) qui est une liste de noms (32) de fichiers associés à des fichiers (34). Lorsqu'un fichier (34) est requis pour utilisation au niveau de l'ordinateur secondaire (16), il est sélectionné à partir du répertoire secondaire (30) et récupéré dans la mémoire de masse (18) de l'ordinateur secondaire s'il est stocké dans cette mémoire ou, si le fichier désiré n'est pas stocké dans la mémoire de masse (18) de l'ordinateur secondaire, le fichier (34) est récupéré, par l'intermédiaire de la liaison de transmission de données (24), dans la mémoire de masse (14) de l'ordinateur de base.
PCT/US1993/002652 1992-03-17 1993-03-11 Systeme d'acces a distance a des fichiers WO1993019420A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US85295692A 1992-03-17 1992-03-17
US07/852,956 1992-03-17

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5446888A (en) * 1994-01-14 1995-08-29 Pyne; Charles F. Remote file transfer method and apparatus
US5805809A (en) * 1995-04-26 1998-09-08 Shiva Corporation Installable performance accelerator for maintaining a local cache storing data residing on a server computer
US6076084A (en) * 1994-01-03 2000-06-13 Norton-Lambert Corp. File transfer method and apparatus utilizing delimiters
WO2003025760A1 (fr) * 2001-09-20 2003-03-27 Cebridge Pty. Ltd. Protection et extraction de donnees

Citations (3)

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Publication number Priority date Publication date Assignee Title
US4891785A (en) * 1988-07-08 1990-01-02 Donohoo Theodore J Method for transferring data files between computers in a network response to generalized application program instructions
US4914583A (en) * 1988-04-13 1990-04-03 Motorola, Inc. Method of indicating processes resident within a cell of a data processing system
US5155847A (en) * 1988-08-03 1992-10-13 Minicom Data Corporation Method and apparatus for updating software at remote locations

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4914583A (en) * 1988-04-13 1990-04-03 Motorola, Inc. Method of indicating processes resident within a cell of a data processing system
US4891785A (en) * 1988-07-08 1990-01-02 Donohoo Theodore J Method for transferring data files between computers in a network response to generalized application program instructions
US5155847A (en) * 1988-08-03 1992-10-13 Minicom Data Corporation Method and apparatus for updating software at remote locations

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6076084A (en) * 1994-01-03 2000-06-13 Norton-Lambert Corp. File transfer method and apparatus utilizing delimiters
US5446888A (en) * 1994-01-14 1995-08-29 Pyne; Charles F. Remote file transfer method and apparatus
USRE39458E1 (en) 1994-01-14 2007-01-02 Laplink Software, Inc. Remote file transfer method and apparatus
US5805809A (en) * 1995-04-26 1998-09-08 Shiva Corporation Installable performance accelerator for maintaining a local cache storing data residing on a server computer
US5881229A (en) * 1995-04-26 1999-03-09 Shiva Corporation Method and product for enchancing performance of computer networks including shared storage objects
WO2003025760A1 (fr) * 2001-09-20 2003-03-27 Cebridge Pty. Ltd. Protection et extraction de donnees
GB2396723A (en) * 2001-09-20 2004-06-30 Pty Ltd Cebridge Data protection and retrival

Also Published As

Publication number Publication date
AU3929593A (en) 1993-10-21

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