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Linear-motion bearing
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A linear-motion bearing or linear slide is a bearing designed to provide free motion in one direction. There are many different types of linear motion bearings.
Friction Bearing Rack Slide
Friction Bearing Rack Slide
Ball bearing
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A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races.
A ball bearing for skateboard wheels with a plastic cage
A ball bearing for skateboard wheels with a plastic cage
Wingqvist developed a self-aligning ball bearing
Wingqvist developed a self-aligning ball bearing