original Patent - Rolf Medger in Stolp , 1897 , Elektromagnetische Mechanik mit befestigtem Mikrophon , Klavier , Musik

Published by Patentinhaber: Rolf Medger in StolpPatent: Elektromagnetische Mechanik mit auf dem Resonanzbodenbefestigtem MikrophonPatentiert am: 01.12.1897P-42
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