The Champ patents a wrench


Blueprint (copy)
Date: 
Tue, 1922-04-18

On this date in 1922, Jack Johnson, the world's first African American heavyweight boxing champion, patented a wrench; (U. S. patent#1,413,121).

Reference:
1001 things everyone should know about African American History
by Jeffery C. Stewart,
Copyright 1996, DoubleDay
ISBN 0-385-47309-5

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