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DE323197C
(de )
1920-07-17
Verfahren zur Wahrnehmbarmachung radiotelegraphischer Zeichen
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(de )
1927-05-04
Verfahren und Einrichtung zur Erzeugung von Toenen (Musikinstrument)
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(de )
1931-07-11
Einrichtung zur verstaerkten Kenntlichmachung elektrischer Spannungs- und Ladungsschwankungen
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(de )
1908-05-11
Polwechsler, insbesondere für Telephonanlagen mit harmonischem Läutesystem.
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