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| Number | Title | Issue Date |
| 4056154 | Squaring off and reaming tool for deep elongated trench excavations There is disclosed a tool for squaring off and reaming the walls of an elongated trench excavation which has been previously formed utilizing the slurry trench excavation method. The tool is constituted by a pair of spaced parallel steel beams which are c... | 11/01/1977 |
