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Davidson Equipment Leasing LLLP
| Davidson Equipment Leasing LLLP Patent applications | ||
| Patent application number | Title | Published |
|---|---|---|
| 20080229702 | TRENCH BOX SAFETY LADDER - Various embodiments of the present invention relate to trench box safety ladders and methods of constructing trench boxes with safety ladders. In one embodiment, a trench box comprises two side walls with a plurality of supports between the two walls, a built-in ladder within the inner face of a side wall, and an extension ladder positioned on the top face of the side wall. | 09-25-2008 |