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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 |
| 7558643 | Lithographic apparatus, method of determining a model parameter, device manufacturing method, and device manufactured thereby A method according to one embodiment of the invention relates to determining at least one parameter of a model that provides information about a position of an object. The object may include a plurality of alignment marks of which desired positions are known. The me... | 07/07/2009 |
