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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 |
| 4049129 | Automatic coupling for streetcars and the like An automatic coupling for streetcars and like vehicles comprises a connecting rod pivotally connected to the vehicle and a coupling head pivotally connected to the connecting rod. The coupling head is pivotally disposed in the horizontal plane between an ... | 09/20/1977 |
