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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.
The Invention of Sign Language. No one person invented sign language. It is reasonable to think that sign language was widely used before standardized systems were developed. Deaf people needed a way to communicate with others and many had a set of signs that they used at home to make themselves understood.The first system of hand signals as a language was invented by Juan Pablo de Bonet in 1620. He created the first book with sign language signals for teaching deaf people.he first system of hand signals as a language was invented by Juan Pablo de Bonet in 1620. He created the first book with sign language signals for teaching deaf people.