- - rolling friction-reducing part
- - Friction-reducing sphere device
- - Friction-reducing sphere
- - Round machine part
- - Friction-reducing machine part
- - Pea-sized machine part
- - Anti-friction device
- - Rolling anti-friction machine part
- - Friction-reducing device
- - In-line skate part
- - Rolling anti-friction machine part (2 wds.)
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