You can read about Jack Johnson's biography.
Jack Johnson - Patent Drawings For A Wrench
By Mary Bellis, About.com
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.
Index: Jack Johnson - Patent Drawings For A Wrench
- Jack Johnson - Patent Drawing View A
- Jack Johnson - Patent Drawing View B
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