Pentode (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "Pentode" in German language version.

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Patent US1945040A: Means for amplifying electric oscillations. Angemeldet am 25. November 1927, veröffentlicht am 30. Januar 1934, Anmelder: Philips NV, Erfinder: Gilles Holst, Bernardus Dominicus Hubertus Tellegen.‌