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Publication of FR8578EpublicationCriticalpatent/FR8578E/en
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
FR8578D1906-10-201907-10-12
Method and apparatus for recording and reproducing long speeches, music, etc., using phonographic instruments
ExpiredFR8578E
(en)