| 摘要 |
A hand tool for restoring roundness to an open end of a pipe coupling formed of copper or the like. The tool has a series of sections of non-concentric grooves of increasing diameters separated by ridges over which the open end of the coupling is slipped. The ridge bordering the inside of the groove serving as a mandrel and the ridge bordering the outside of the groove serving as a die. Holes may be provided in the tool for use in restoring roundness to an open end of a pipe.
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