FR807391A - Perfectionnements apportés aux procédés et dispositifs pour l'obtention de phonogrammes multiples à largeur variable pour films sonores
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Perfectionnements apportés aux procédés et dispositifs pour l'obtention de phonogrammes multiples à largeur variable pour films sonores
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Int Tobis Mij N V
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Int Tobis Mij N V
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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
FR807391D1935-06-181936-06-18Perfectionnements apportés aux procédés et dispositifs pour l'obtention de phonogrammes multiples à largeur variable pour films sonores
ExpiredFR807391A
(fr)