FR787490A -
Device for the continuous recording and reproduction of photographic sound tracks parallel to the edges of a film in the form of an endless strip
- Google Patents
Device for the continuous recording and reproduction of photographic sound tracks parallel to the edges of a film in the form of an endless strip
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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
FR787490D1934-03-211935-03-18
Device for the continuous recording and reproduction of photographic sound tracks parallel to the edges of a film in the form of an endless strip
ExpiredFR787490A
(en)