Note
QST, Nov 1954, p. 87. (announced)
Allied Radio catalog 1955 (copyright 1954), p. 189.
QST, Jul 1955, p. 133.
QST, Aug 1955, p. 79. (a few details)
Allied Radio catalog 1956 (copyright 1955), p. 195.
QST, Apr 1956, p. 83. (speaker)
Walter Ashe catalog 1957 (probably issued in 1956), p. 7.
Allied Radio catalog 1957 (copyright 1956), p. 243.
