TH110178ATH801005480ATH0801005480ATH110178ATH 110178 ATH110178 ATH 110178ATH 801005480 ATH801005480 ATH 801005480ATH 0801005480 ATH0801005480 ATH 0801005480ATH 110178 ATH110178 ATH 110178A
Glass for use as substrate for information recording medium,substrate for information recording medium and information recording medium, and their production methods
Glass for magnetic recording medium substrate, magnetic recording medium substrate, magnetic recording medium, glass spacer for magnetic recording and reproducing apparatus, and magnetic recording and reproducing apparatus
Recording layer for optical information recording medium, optical information recording medium, and sputtering target for optical information recording medium