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An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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| Number | Title | Issue Date |
| 4645066 | Adjustable conveyor assembly for regular periodic transverse movement of a longitudinally moving conveyor belt A conveyor assembly having one of its conveyor rollers which is movable to change the angle of its axis to the conveyor direction for causing sideways movement of the conveyor belt. Movement of the roller is controlled by a linkage drivably connected to a... | 02/24/1987 |
