| 摘要 |
PROBLEM TO BE SOLVED: To provide a working device for a plate-like body small and furnished with a covering means capable of preventing splashing of working water and reusing working water, too. SOLUTION: An upper clamp 24 and a cover 31 to cover a diamond drill 13, an expansion cover 41 to cover a diamond drill 16 and a blower 60 to suck air in the upper clamp 24, the cover 31 and the expansion cover 41 are provided.
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