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Relation: subclass

DigitalDataStorageDevice12An instance of DigitalDataStorageDevice is an ElectronicDataStorageDevice intended to be used...^
    ReadOnlyMemoryDataStorage1A DigitalDataStorageDevice on which it is not possible to write or alter any DigitalData except...^
        CD-ROM.An instance of CD-ROM is a CompactDisc in the CompactDisc-ReadOnlyMemory (CD-ROM) format, whi...^

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