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| Number | Title | Issue Date |
| 7500806 | Method and apparatus for constructing filter zones in earthfill dams A method and apparatus for constructing a filter zone of an earthfill dam, in which the filter zone includes adjacent coarse and fine filter layers. The coarse and fine filter materials are discharged simultaneously from an earthmoving vehicle having an ejector body... | 03/10/2009 |
| 6626447 | Pipeline patch trolley A vehicle for transporting and installing an annular patch in a pipeline having a curved inside surface. There is a tubular support member and an annular bladder mounted on the support member for forcing the patch against the inside of the pipeline when i... | 09/30/2003 |
| 6158925 | Apparatus for installing pipeline fill An apparatus for depositing fill material over a pipeline. A wide-track carriage is provided for straddling the pipeline trench, and this includes a shaker screen mechanism for screening aggregate fill material, such as excavated native spoils. The screen... | 12/12/2000 |
