Patents
- US 1113149, Armstrong, E. H., "Wireless receiving system", published October 29, 1913, issued October 6, 1914
- US 1342885, Armstrong, E. H., "Method of receiving high frequency oscillation", published February 8, 1919, issued June 8, 1920
- US 1424065, Armstrong, E. H., "Signalling system", published June 27, 1921, issued July 25, 1922
- US 2211091, Braden, R. A., "Superregenerative magnetron receiver" 1940.
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