The Rockwell hardness tester was devised and afterward applied for patent by both Hugh M. Rockwell and Stanley P. Rockwell on July 15,1914.
Shortly after, a patent was applied for on July 15,1914. The Rockwell hardness tester was co-invented by both Hugh M. Rockwell and Stanley P. Rockwell.
The Rockwell hardness tester was co-invented by both Hugh M. Rockwell and Stanley P. Rockwell. Shortly after, a patent was applied for on July 15,1914.
The Rockwell hardness tester was co-invented by both Hugh M. Rockwell and Stanley P. Rockwell. Shortly after, a patent was applied for on July 15,1914.