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G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
G10K15/00—Acoustics not otherwise provided for
G10K15/04—Sound-producing devices
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AT187313D1954-01-111955-01-10Einrichtung zur Aufnahme und Wiedergabe von Magnettonaufzeichungen mit einem Hochfrequenzgenerator
AT187313B
(de)