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ES394698A1
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Improvements introduced in the cassettes for magnetic tape. (Machine-translation by Google Translate, not legally binding)
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DE828278C
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Process for the preparation of dirty shellacs for record masses
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DE972635C
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Methods and devices for recording sound processes in adjacent tracks while changing the track spacing
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DE825463C
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Device for measuring the viscosity of plastic materials
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DE815547C
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Device to protect the magnetic heads in magnetic sound devices
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DE813608C
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Device for cutting magnetic tapes
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DE880501C
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Record with side writing
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DE896568C
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Pickups for records
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DE882499C
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Device for measuring the level of vinyl recordings
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