| 摘要 |
A device for use in removing a conveyance member from a material includes a displacement element (12, 1012) and a self-propelling driving element. The displacement element (12, 1012) is for being placed at least partly around a conveyance member (16) and for displacing material as the displacement element (12, 1012) is advanced along a conveyance member(16). The driving element is coupled to and movable with the displacement element (12, 1012) to advance the displacement element along a conveyance member(16). |
