Note
QST, Nov 1954, p. 88.
QST, Jan 1955, p. 91.
QST, Jan 1955, p. 101. "Matchmaker" also referred to as "Matchmaster."
Allied Radio catalog 1956 (copyright 1955), p. 200.
Walter Ashe catalog 1957 (probably issued in 1956), p. 3.
650 - 52Ω
651 - 73Ω
Still available surplus as new-old-stock: CQ, Feb 1963, p. 98.
References
Brief description. Electronics World, May 1959, p. 150.