Autotune┬« Phone Set – Remote Unit
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front This unit was used to remotely operate AutoTune®-controlled Duplex Transmitter/Receiver equipment.
There seems to be no push-to-talk button included, so maybe the transmitter was VOX operated.
Note that there was a jack for a CW key.
Many of the Autotune® mechanisms were built for 10 channels which fields the question, what happened when you dialed the letter A?