About YAMAMOTO HIDEYUKI
About 電気化学工業
About TAMURA KEN'ICHI
About ONOZAWA MOTOHISA
About nodular graphite cast iron
About Nondestructive testing
About Weld defect
About 超音波
About 支援
About 球状黒鉛鋳鉄
About ステンレス鋼
About 拡散接合
About 欠陥検出
About 評価