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Publication of FR692989ApublicationCriticalpatent/FR692989A/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
G11B3/02—Arrangements of heads
G11B3/04—Multiple, convertible, or alternative transducing arrangements
FR692989D1929-07-081929-07-08Procédé et dispositif pour l'obtention d'échos et de résonances à l'aide de surfaces enregistrées usuelles
ExpiredFR692989A
(fr)