About NOMURA MITSUYOSHI
About GO YUHA
About 超音波Techno
About ultrasonic machining
About oscillation
About improvement of efficiency
About grinding
About single crystal
About sapphire
About machining defect
About grinding stone
About tool wear
About spirality
About experiment
About resistance
About surface roughness
About ellipse
About modification
About ore
About precious stone
About mechanical property
About property
About Special machining
About 超音波加工
About 楕円
About 超音波
About 微振動
About 援用
About 高能率
About 研削
About 単結晶
About サファイア
About スパイラル