| 摘要 |
The tapping (2), which has a rotational symmetry and a coplane within one side of a wall and is projected on the other side of the wall, is equipped across the wall. The device, used to support and move a tool within the tapping, is composed of a wall (1), arms (7a, 7b, 7c), a centering bell (9), an inhalation circular plate (20), an expansion seal (40), bearings (25, 41), a tool-supporting rod (8), a tool (70), and a sliding plate (46).
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