​April 18, 1922: Jack Johnson Receives A Patent

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Jack Johnson patents his improvements to the wrench.

While Johnson was in Leavenworth Federal Prison in Kansas, he found a need for a tool which would help tighten of loosening fastening devices and modified a wrench for the task. 

John Arthur “Jack” Johnson, nicknamed the Galveston Giant was a boxer. At the height of the Jim Crow era, Johnson became the 1st African American world heavyweight boxing champion (1908–1915).

In a documentary about his life, Ken Burns notes that “for more than thirteen years, Jack Johnson was the most famous and the most notorious African-American on Earth.”

Read more stories like this at: Daily Black History Facts

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