| 摘要 |
A cutting blade having an annular cutting edge portion composed of electroformed abrasive grain layers in which abrasive grains are fixed by electroforming, the annular cutting edge portion being composed of a central electroformed abrasive grain layer and outer electroformed abrasive grain layers formed on both sides of the central electroformed abrasive grain layer. The central electroformed abrasive grain layer is an abrasive grain layer having a low concentration and the outer electroformed abrasive grain layers are each an abrasive grain layer having a higher concentration than the central electroformed abrasive grain layer.
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