On this day in 1904 the patent for Blow Testing Apparatus was granted. U.S. Patent No. 750,593.
The object of this invention is to provide an apparatus for testing the punching or hitting power of the arm.
On this day in 1904 the patent for Blow Testing Apparatus was granted. U.S. Patent No. 750,593.
The object of this invention is to provide an apparatus for testing the punching or hitting power of the arm.