Lee De Forest (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "Lee De Forest" in German language version.

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espacenet.com

Patent US841387: Device For Amplifying Feeble Electrical Currents. Angemeldet am 25. Oktober 1906, Erfinder: Lee de Forest (Die de Forest-Triode).‌
Patent DE249142C: Relais für undulierende Ströme. Angemeldet am 20. Dezember 1910, veröffentlicht am 12. Juli 1912, Erfinder: Robert von Lieben, Eugen Reisz, Siegmund Strauss (Seite 1, Zeile 37ff).‌