About SAKAI TATSUO
About SUGETA ATSUSHI
About ITO TAKAMOTO
About fatigue test
About fatigue
About metallic material
About materials science
About certification
About qualification
About tensile test
About hardness test
About engineer
About technical history
About Japan
About engineering education
About metal fatigue
About education
About 技能検定
About 技能士
About Material testing
About 金属疲労
About 試験
About 技能
About 資格
About 検定
About 制度