| 摘要 |
PROBLEM TO BE SOLVED: To improve a cutting property by certainly holding a workpiece without making a mark such as an impression on a worked product on a drilling device. SOLUTION: The drilling device 10 is constituted of a die 12 and a punch 13, and a cutting blade 12A of the die 12 is projected from a workpiece placing surface 14 of the die 12 and arranged.
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