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Priority to FR786200ApriorityCriticalpatent/FR1228111A/en
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Publication of FR1228111ApublicationCriticalpatent/FR1228111A/en
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
FR786200A1959-02-101959-02-10 Optical method of reading discs and its useExpiredFR1228111A (en)