| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary blade that can prevent from being chipped. SOLUTION: Convex parts 2d ... are formed on the parts of cutting edges 2b ... on the outer periphery of the rotary blade 2a so that the convex parts each are projected from the edges 2b ... outward. COPYRIGHT: (C)2006,JPO&NCIPI
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