Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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Filing date
Publication date
Application filed by IG Farbenindustrie AGfiledCriticalIG Farbenindustrie AG
Application grantedgrantedCritical
Publication of FR851204ApublicationCriticalpatent/FR851204A/fr
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
FR851204D1938-03-051939-03-04Dispositif pour la prise et la reproduction d'enregistrements sonores en push pull
ExpiredFR851204A
(fr)
Dispositif pour la reproduction d'un enregistrement photo-phonographique dans lequelles demi-ondes positives et les demi-ondes négatives sont enregistrées suivant des traces sonores distinctes