About HANYU HIROYUKI
About オーエスジー
About Diamond
About diamond tool
About covering
About film production
About chemical vapor deposition
About surface treatment
About microcrystal
About DLC film
About technical progress
About ore
About precious stone
About Machine tool elements,jigs,chucks
About Other surface treatment
About Carbon and its compounds
About ダイヤモンド
About 被膜
About 切削工具
About 応用