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Publication of FR574726ApublicationCriticalpatent/FR574726A/en
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B23/00—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
G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
G11B23/42—Marks for indexing, speed-controlling, synchronising, or timing
FR574726D1922-12-191923-12-18
Improvements to gramophones and phonograms for them
ExpiredFR574726A
(en)