1920’s

By Goofy36

  • KDKA becomes first company to broadcast publicly over the radio

    KDKA becomes first company to broadcast publicly over the radio

  • Alice H. Parker invents gas heater

    Alice H. Parker invents gas heater

  • James E. West and colleagues invent microphone

    James E. West and colleagues invent microphone
  • Period: to

    1920’s Class Project

  • Garret Morgan invents America’s first patented 3 way traffic signal

    Garret Morgan invents America’s first patented 3 way traffic signal

  • Robert Goddard launches first liquid fueled rocket

    Robert Goddard launches first liquid fueled rocket