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Int Tobis Mij N V
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Int Tobis Mij N V
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Publication of FR811992ApublicationCriticalpatent/FR811992A/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
FR811992D1935-10-241936-10-22
Improvements to devices for photographic recording of alternating phonograms
ExpiredFR811992A
(en)