| http://www.w3.org/ns/prov#value | - The main frame unit 51 has a floppy disk mounting slot 51 a for mounting a floppy disk, and a CD-ROM mounting slot 51 b for mounting a CD-ROM. [0066] The main frame unit 51 comprises, as shown in FIG. 3, a CPU 511 for executing a various types of program, a main memory 512 in which a program stored in a hard disk unit 513 is read out and developed for execution by the CPU 511, the hard disk unit 5
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