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FR1305040A
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Apparatus for the preparation of master plates of spiral track magnetic recordings
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FR1305039A
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Magnetic recording and reproducing apparatus on a thin magnetizable sheet
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GB912004A
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Magnetic recording and reproducing apparatus
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US3060940A
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Device for preparing magnetic record matrix plates in magnetic recording machines ofspiral track type
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US3091467A
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Devices for supporting magnetic transducer heads on magnetic recording and reproducing machines
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US3074724A
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Apparatus for positioning recording and recorded sheets on a magnetic recorder and reproducer
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US3046357A
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Magnetic recording and reproducing machine
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US3010374A
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Photographic camera equipped with an exposure meter
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