The W A Martin Invented Lock
Oct. 2, 2024
W. A. Martin, African American inventor, patented the lock (July 21, 1889). This was an improvemen… | Black history facts, African american inventors, Black history Master Builders' Association - In 1889, W. A. Martin patented the lock, improving upon the 4,000-year-old bolt invented by the Chinese. Martin's lock consisted of a cylinder and spiral spring, coiled around R-Evolution - African American Inventor: W.A. Martin 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 First Lock Improvement is Patented - African American Registry W.A. Martin – Los Angeles Sentinel W. A. Martin - Wikipedia | The W A Martin Invented Lock
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