Patent classifications
G
PHYSICS
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G11
INFORMATION STORAGE
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G11B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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25/00
Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing; , e.g. dictating apparatus; Combinations of such apparatus
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G11B25/04
using flat record carriers, e.g. disc, card
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G11B25/043
using rotating discs
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