with a single key which transmits dots in one position and dashes in a second position

Full Title

Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code (teaching apparatus therefor G09B; telegraph tapping keys H01H21/86) > Apparatus or circuits at the transmitting end > with a restricted number of keys, e.g. separate key for each type of code element > with a single key which transmits dots in one position and dashes in a second position