Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7328662 | Platform gate door device The invention provides a platform gate door device equipped with highly reliable photoelectric obstacle detectors that do not malfunction by disturbance light that moves, such as sunlight. The platform gate door device comprises a platform gate door 13 instal... | 02/12/2008 |
| 7025004 | Passenger rail car sliding door with high platform threshold An improved door assembly has a single movable door and may have a separate movable high platform threshold. The door assembly is formed of an upper door section and a lower door section which is fixed to the upper door section. A support member may be integral with... | 04/11/2006 |
| 6799522 | Passenger rail car sliding door with high platform threshold An improved door assembly having a single movable door and a separate movable high platform threshold. ... | 10/05/2004 |
| 4175495 | Entrance step arrangement for a short distance transport vehicle An entrance step arrangement particularly for short distance vehicles, especially rail vehicles, which has at least one intermediate step, a cover for covering up the step or steps, a foldable guard plate, and transmission elements interposed between a dr... | 11/27/1979 |
