DIFF Subgroup
G11B 23/38 Visual features other than those contained in record tracks or represented by sprocket holes
Introduced: September 1968
Full Title
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 > Visual features other than those contained in record tracks or represented by sprocket holes
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
Child Classifications
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- G11B 23/40 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 IPC+CPC Available in IPC and CPC
- G11B 23/42 Marks for indexing, speed-controlling, synchronising, or timing IPC+CPC Available in IPC and CPC
- G11B 23/44 Information for display simultaneously with playback of the record, e.g. photographic matter (associated working of cameras or projectors with sound recording or reproducing means G03B31/00) IPC+CPC Available in IPC and CPC