1879 Coffin
1879
Phelps/Western Union Double Crown Telephone
1878

Wall phone with two butterstamp receiver/transmitters

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Wall phone with two butterstamp receiver/transmitters

About This Phone

People often became confused switching a single transmitter-receiver constantly between mouth and ear, so a second one was added. You could use either to talk while listening through the other. The crank was turned to signal the operator.