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Application filed by Wilhelm ZoephelfiledCriticalWilhelm Zoephel
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DK46412D1929-07-081930-03-26Højttaler, hvis lydfrembringende, svingende Legeme udgøres af Resonansbunden i et Klaver, Flygel eller lignende.
DK46412C
(da)
Un procedimiento para cebar y mantener todas las cuerdas de un piano por medio de un pequeño número de órganos auxiliares, distintos, con los dispositivos correspondientes para su realización.