Before revision: 1087892, Wilhelm Schloemilch and Otto von Bronk Means for receiving electrical oscillations, filed March 14, 1913; granted February 17, 1914 and rediscovered and extended to multiple tubes in 1917 by Marius Latour<ref name="Latour">US Patent no.
After revision: 1087892, Wilhelm Schloemilch and Otto von Bronk Means for receiving electrical oscillations, filed March 14, 1913; granted February 17, 1914 and rediscovered and extended to multiple tubes in 1917 by Marius LatourUS Patent no.