CQ, Feb 1965, p. 100.
QST, May 1965, p. 168.
QST, Jul 1966, p. 161. List of all models.
QST, Dec 1967, p. 158. List of models.
QST, Apr 1969, p. 141. List of new models.
Popular Electronics, Jan 1969, p. 24. (Model SU add-on squelch)
References
Brief description. Popular Electronics, Apr 1968, p. 22.
