| 摘要 |
PROBLEM TO BE SOLVED: To provide a broach (cutting tool) usable by replacing only a blade part. SOLUTION: (1) This broach 10 constitutes its blade part 12 and main unit 11 in a separate unit to make the blade part 12 mountable/demountable relative to the main unit 11. (2) The broach 10 divides the blade part 12 into a plurality of parts.
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