8.05.81

Print, Photographic

E. F. Johnson Company Product. Circuit Board. 9 1/2" x 7 1/2" black and white photograph of an E. F. Johnson Co. radio product, the circuit board of a Multi-Channel Call Guard, part of the Mobile Series Options; 16 channel capability, PROM Programmable, Synthesizes all 32 EIA CTCSS tones, RF immunity to all frequency bands, Optional scan with tone,

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