About KOGA FUMIO
About 古賀
About NINOMIYA SHIN'ICHI
About lathe turning
About cutting tool
About carbide tool
About multi-spindle machine tool
About tool wear
About hardened steel
About metal round bar
About rotating tool
About mechanical property
About property
About Turning,boring
About 未来
About 丸棒
About 焼入れ鋼
About スピン
About ターニング