£25
Condition Indicator dated 1955 by the British Army which was used to check the output power level of the SR B70 radio relay stations used for the BID 100, circa 1954, is a single channel speech cipher system which secures point-to-point telephone lines and radio links. A plate marked Serial No. 001016, Manufacturer CYA/NC, stamped in ink with a Queen's Crown 8114, with original paper inspection label.
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