Note
QST, Jul 1950, p. 77. (75A-2, nice photo of Art Collins. Lots of details.)
Allied Radio catalog 1951 (copyright 1950), p. 141.
Allied Radio catalog 1952 (copyright 1951), p. 138.
QST, Feb 1952, p. 2. (Nice interior photo)
QST, Apr 1952, p. 2.
Allied Radio catalog 1953 (copyright 1952), p. 38.
Walter Ashe catalog, 1954, p. 4.
References
Updating: CQ, May 1961, p. 44.