Ball Bearings - U.S. Customs and Border Protection
The Classification of Ball Bearings, Roller Bearings and Parts Thereof April 2012 . Other bearing innovations continued to emerge in the 1800's and 1900's. In 1883, Friedrich Fischer created the ball-grinding machine, a machine to mill and grind balls of equal size and exact roundness. 11. This creation spawned the rolling bearing industry
قرأ أكثر