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September 15, 2016 - 4:59pm
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Archaeo-audio III: 1944 Remote Control
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There were remote controls made in that era that used a telephone dial in conjunction with telephone system selector relays.
I don't know about a huge dial; it was more likely just a standard pay telephone dial (not small).
In any case, one dial and stepper relay would allow you to connect to 10 different circuits, or to select an unconnected circuit or dummy load to mute the system.
It took a lot of wires, but it was not that hard to do.