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TONFILM A G DEUTSCHE
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TONFILM A G DEUTSCHE
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Application filed by TONFILM A G DEUTSCHEfiledCriticalTONFILM A G DEUTSCHE
Application grantedgrantedCritical
Publication of FR672623ApublicationCriticalpatent/FR672623A/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
FR672623D1928-04-071929-04-05Procédé de reproduction de phénomènes acoustiques enregistrés photographiquement
ExpiredFR672623A
(fr)