SCR-56
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Low-power Aircraft CW trainer. Tuning fork buzzer R/B SCR-65 1916 (only experimental) ??
References
- Radio Pamphlet No. 12 Airplane Radio Transmitter S.C.R. 56 SCR-56 ??(may not have been published due to cancellation of set)?? see Report of the Chief Signal Officer, United States Army, to the Secretary of War.