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Publication of FR420398ApublicationCriticalpatent/FR420398A/fr
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
G11B3/68—Record carriers
G11B3/70—Record carriers characterised by the selection of material or structure; Processes or apparatus specially adapted for manufacturing record carriers
FR420398D1910-09-141910-09-14Disque de gramophone permettant l'enregistrement et la reproduction des voix et des sons, et son mode de fabrication
ExpiredFR420398A
(fr)