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Universum Film AG
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Universum Film AG
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Application filed by Universum Film AGfiledCriticalUniversum Film AG
Application grantedgrantedCritical
Publication of FR894591ApublicationCriticalpatent/FR894591A/en
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
FR894591D1939-06-261943-05-11
Improvements to the reproduction of sound recordings using the half-wave and intensity variation method
ExpiredFR894591A
(en)