GAMAGE TRAINING KEY or MORSE STATION, 1930's
Made for training amateur radio enthusiasts. Not to be considered as a toy more a training aid.
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A small Galvanometer in the centre was used for indicating the direction of the message. More than one station like this can be connected, all the units receiving the same message, the needle will indicate where the message originated, Up line or Down line (Rail terminology). See the history of telegraphy.