The Stanley Works was founded by Frederick Trent Stanley in 1843, originally a bolt and door hardware manufacturing company located in New Britain, Connecticut. The Stanley Rule and Level Company was founded in 1857 by Henry Stanley in New Britain, Connecticut. In 1920, this company merged with the separate but related Stanley Works, founded by Henry Stanley's cousin Frederick Trent Stanley, and continued operating as its hand tools division.[
Around 1937, Stanley acquired the British J. A. Chapman company, a British manufacturer of carpentry tools and other items (including bayonets during World War I) formerly located in Sheffield, from Norman Neill. This helped Stanley to enter the British market.
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