| 摘要 |
Guide bar for chain saws, where the chain is supposed by a nose sprocket while traversing the front end. Regions of the edges of the guide bar are locally hardened to a higher hardness than the rest of the guide bar. The regions of hardness are only where the chair impacts the bar near an attachment end of the guide bar after having left the drive sprocket of the power socket, and where the chain settles on the guide bar edge after having been supported by the nose sprocket while traversing the nose curvature.
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