| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein it is hard to drive a heavy hammer drill upward with the sufficient man power, and it is dangerous for eyes to receive dust and dirt for a work in the high place with a face directed upward. SOLUTION: An auxiliary tool is fitted with the hammer drill for making the work the same as the work performed on the floor surface, which is safe. Working efficiency is thereby remarkably improved, and above all, the work can be performed by the man power smaller than ever before. COPYRIGHT: (C)2008,JPO&INPIT
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