W. A. Martin, African American inventor, patented the lock (July
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
Black Inventors - ™
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African American Inventors - Inventions - ResearchGuides at Linda Hall Library
P. Gillett's inventions contributed to Missouri's early rail foundation, Article
who is W.A. martin by Ardaesha Walker on Prezi
African American Inventors Who Made Us More Secure – California Metro Patrol
Rosetta Writer
Rosetta Writer
7 Black Inventors Who Made Our Lives Better
Top 101 Black Inventors & African American's Best Invention Ideas that Changed The World
Computer mouse inventor Douglas Engelbart dies