Note
73, Sep 1963, p. 65.
73, Feb 1964, p. 45.
From the ad:
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The Mars Control Console contains in one unit a Kilowatt SWR Bridge measuring both 52 or 75 ohms—Hybrid phone patch—Internal speaker with provision to switch to external speaker if desired, plus several switches for control of xmtr, receiver, etc. as desired. All this at an amazing low price.