Black inventor patents first lock improvement in 4000 years

Date: 
Sun, 1889-07-21

On this date in 1889, W. A. Martin, African American inventor, patented the lock. This device was an improvement over the 4000-year-old bolt invented by the Chinese.

Martin's lock consisted of a cylinder and spiral spring, coiled around a metal pin. It was the forerunner of modern door locks.

Reference:
U.S. Patent and Trademark Office
Mail Stop USPTO Contact Center
P.O. Box 1450
Alexandria, VA 22313

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