发明申请
US20070119283A1 OVERDRILLING APPARATUS 有权
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OVERDRILLING APPARATUS
摘要:
An apparatus for overdrilling a buried line includes a rotatably driven thrust linkage and/or traction linkage, and has a forward end which is connected to a ring-shaped to hollow cylindrical overdrilling head which embraces the line. The overdrilling head is provided interiorly with a centering protrusion for spontaneous centering of the overdrilling head in concert with the line.
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