About YOSHIDA SUSUMU
About 古河電気工業中研
About TAKAHASHI HIROSHI
About 古河電気工業中研
About optical fiber
About Manufacturing of glass
About Optical waveguide,optical fibers,and fiber optics
About Glass fibers,ceramic fibers
About 高信頼性
About 電子機器部品
About 赤外光
About 酸化ゲルマニウム
About ガラス
About 光ファイバ