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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 |
| 4873513 | Automated map display system An automated map display system stores in an optical storage unit a plurality of map portion images generated from any assortment of physical maps having various geographical coverages, fields of view, map scales, cartographic projections, compass orienta... | 10/10/1989 |
