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Application filed by Axel Carl Georg Petersen, Arnold PoulsenfiledCriticalAxel Carl Georg Petersen
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Publication of DK46468CpublicationCriticalpatent/DK46468C/da
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
DK46468D1930-09-271931-03-17Lydfilm og Fremgangsmaade til Fremstilling, Nedskrivning eller Kopiering af en saadan.
DK46468C
(da)