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Publication of FR397808ApublicationCriticalpatent/FR397808A/en
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
G11B3/44—Styli, e.g. sapphire, diamond
G11B3/46—Constructions or forms ; Dispositions or mountings, e.g. attachment of point to shank
FR397808D1908-12-221908-12-22
Advanced reproducing diaphragm system for sapphire and needle discs for phonographs and gramophones
ExpiredFR397808A
(en)