A region including an engaging hole is given surface treatment such as partial quench hardening by induction hardening for improving surface hardness of the region. The partial quench hardening by induction hardening provides the region with satisfactory mechanical strength or surface hardness enough for resisting deformation of the engaging hole and wear-out of an edge of opening of the engaging hole caused by putting in and out of the lock pin.

 
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> Apparatus and method for estimating residual gas amount of internal combustion engine, and apparatus and method for controlling intake air amount of internal combustion engine using estimated residual gas amount
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