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Railways PYQCBT 2 2017

RRB NTPC · Question 88

Who patented the three-position traffic signal in 1923?

  1. Garrett Morgan

  2. J.P. Knight

  3. George Eastman

  4. Robert Adler

Show answer & explanation

Answer: (A) Garrett Morgan

Explanation

Garrett Morgan, an African-American inventor, patented a three-position traffic signal in 1923.