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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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23/00
Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus; ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
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G11B23/38
Visual features other than those contained in record tracks or represented by sprocket holes; the visual signals being auxiliary signals
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G11B23/40
Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
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