Quote:
Originally Posted by rambo1152
The transmitter must be back-to-back with the receiver, like a Trimphone.
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By which I assume you mean that the transmitter is physically located at the rear of the receiver housing with an acoustic tube to the mouthpiece. In this case the tube is the handset itself.
By the way, I have sometimes heard these referred to by the nickname "hangman" telephone - for obvious reasons.