Armstrongov oscilator (Serbian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Armstrongov oscilator" in Serbian language version.

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Alexander Meissner, "Einrichtung zur Erzeugung elektrischer Schwingungen" [Equipment for production of electrical oscillations], Reichspatent no. 291,604 (filed: April 10, 1913; issued: June 23, 1919).