Cutting blade

Abstract

The cutting blade system of the present invention includes a blade portion, an inner side surface having an upwardly curved portion connected to the rear end of the blade portion and increasing in thickness direction, and an outer side surface connecting the front end and the rear end of the inner side surface. It also has a first hole located further rearward than the blade portion and a second hole located further rearward than the first hole. The region of the inner side surface between the center of the first hole and the rear end of the blade portion includes an inner concave surface recessed towards the outer side surface. The region of the outer side surface between the center of the first hole and the rear end of the blade portion includes an outer concave surface recessed towards the inner side surface.

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