| 摘要 |
PROBLEM TO BE SOLVED: To provide a safe and efficient core drill which supplies sufficient water to the blade edge thereof when drilling a reinforced concrete on the like. SOLUTION: A water supply port is provided on a side surface of the edge to supply water from the supply channel inside the screw of the motor unit of the diamond core drill, and thereby water is supplied evenly to the entire interior of the core bit. COPYRIGHT: (C)2008,JPO&INPIT
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