Note
Radio News, Jan 1939, p. 64.
Radio, Jan 1939, p. 150.
QST, Mar 1940, p. 97.
References
Brief description. Radio News, Dec 1938, p. 18. (incorrectly identified as the 2-P)
Brief review. Radio, Jan 1939, p. 150.
Technical description. Jan 1939, p. 36