About YOSHIDA HAJIME
About SAWAKI YOZO
About 元静岡大学
About SAKAIDA YOSHIHISA
About extrusion
About spur gear
About mandrel
About filling
About carbon steel
About hardening (heat treatment)
About Extrusion
About Gears,gear units
About 内径
About 拡張
About 押出し
About 平歯車