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Transcript of The Invention of the Stop Sign. The Stop Sign Progress/Changes Made on the Stop Sign 1915 1925 1935 1945 1955 1965 1975 1915- A man named William Phelps Eno invented a white sign with black letters, in Detroit, Michigan. 1922- Realizing the stop sign was so important, an association was formed to make more stop signs.
Before the first genuine stopwatch was released, another similar timepiece set the mold for the stopwatchâs design and function: the chronograph. While it is known that the first chronograph surfaced in 1821, there is much controversy over who is credited with inventing it.