The telediphone was an early sound recording system, using cylindrical recording media. One such system was used from 20 December 1938 at the US Navy radio intercept station at Shanghai, to monitor the Moscow-Tokyo diplomatic circuit, using two recorders.
The telediphone was an early sound recording system, using cylindrical recording media. One such system was used from 20 December 1938 at the US Navy radio intercept station at Shanghai, to monitor the Moscow-Tokyo diplomatic circuit, using two recorders.
Source: Wikipedia "Telediphone" · CC BY-SA 4.0
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