In 1667, what precursor to the telephone was invented?

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Source:

  • Choice "A": Semaphore system % of users selected this choice.
  • Choice "B": Tin can phone % of users selected this choice.
  • Choice "C": Telegraph % of users selected this choice.
  • Choice "D": Morse code % of users selected this choice.
Did you know...
Abraham Lincoln, the 16th president of the United States of America, was a licensed bartender. Before becoming a lawyer and serving as president, he co-owned a tavern in Illinois by name of Barry and Lincoln.
Image credit: Alexander Andrews.