You can read about Jack Johnson's biography.
Jack Johnson - Patent Drawings For A Wrench
By Mary Bellis, About.com Guide
The world's first African American heavyweight champion Jack Johnson patented improvements to the wrench (U.S. patent# 1,413,121) on April the 18th, 1922.
Jack Johnson
Wrenches and Hardware Tools
Black Inventors - Facts and History
See More About
Explore Inventors
- About.com
- Money
- Inventors
- Famous Inventions
- Invention History Databases
- Inventions A to Z Listings
- W Start Inventions
- Patent Drawing For A Wrench - Jack Johnson