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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SELENOPHON LICHT und TONBILD G
Original Assignee
SELENOPHON LICHT und TONBILD G
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Filing date
Publication date
Application filed by SELENOPHON LICHT und TONBILD GfiledCriticalSELENOPHON LICHT und TONBILD G
Application grantedgrantedCritical
Publication of FR683845ApublicationCriticalpatent/FR683845A/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
FR683845D1928-10-251929-10-23
Device for photographic recording of alternating currents
ExpiredFR683845A
(en)