#telegraphic_signal__telegraphicsignal__radiotelegraphic_signal  a signal transmitted by telegraphy
  supertype:  #signal__sign__signaling  any communication that encodes a message; "signals from the boat suddenly stopped"
  subtype:  #dit__dot  the shorter of the two telegraphic signals used in Morse code
  subtype:  #dah__dash  the longer of the two telegraphic signals used in Morse code

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