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G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B9/00—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor
FR43560D1933-03-111933-03-11Système de reproduction d'ondes sonores, pour film portant un enregistrement sonoredécoupé ou gravé en profondeur
ExpiredFR43560E
(fr)