Patent classifications
G
PHYSICS
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G11
INFORMATION STORAGE
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G11B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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13/00
Recording simultaneously or selectively by methods covered by different main groups; among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor; not otherwise provided for; Reproducing therefrom; not otherwise provided for
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G11B13/04
magnetically; or by magnetisation; and optically; or by radiation, for changing or sensing optical properties
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G11B13/045
combined recording by magnetic and optic means
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