To do this, he used ball bearings in the movement.

The scale has five ball bearings, two on each end and one in the center.

Find out how ball bearings are created in this article.

Looking closer, I saw that they were actually ball bearings.

Some people were used to being treated like ball bearings.

The imports make up 34 percent of the ball bearings used.

The process worked in a way similar to the later invention of ball bearings.

The ball bearing bounced from the opposite side and came back.

Why didn't he let somebody else start manufacturing ball bearings in Colorado?

I don't want it to be supported by all kinds of ball bearings.