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Elisha Graves Otis was an American industrialist, founder of the Otis Elevator Company, and inventor of a safety device that prevents elevators from falling if the hoisting cable fails.
At the age of 40, while he was cleaning up the fact... |
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John Calvin Coolidge, Jr. was the thirtieth President of the United States (1923–1929). A Republican lawyer from Vermont, Coolidge worked his way up the ladder of Massachusetts state politics, eventually becoming governor of that state. His... |
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