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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
FR732609D1932-03-031932-03-03Procédé et appareils d'enregistrement et de reproduction de vibrations et notamment des sons
ExpiredFR732609A
(fr)
Procédé et appareils d'enregistrement et de reproduction de vibrations mécaniques et notamment des sons, et nouveau produit industriel en résultant
Procédé et appareils d'enregistrement et de reproduction de vibrations mécaniques et notamment des sons, et nouveau produit industriel en résultant