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SECRECY SCRAMBLER SET No 8, 1950's
The Secrecy Set No8 distorts the signal to an unrecognisable mush, the circuit is then reversed at the receiving end.
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It would not be difficult to un-distort the message that is sent down the line. This machine is a Transistorised version of the valve equivalent used after the war, and supplied by the British Post Office for commercial use only.