About HISAMATSU SADAOKI
About いすず自動車 研開セ
About KANAZAWA TAKASHI
About いすず自動車 研開セ
About carburizing (heat treatment)
About Hardening not due to thermal operation
About Surface hardening
About Gears,gear units
About 浸炭
About 歯車
About ショットピーニング
About 強度向上