EU Trademark Classification EU01 Chemicals Coatings containing quartz for optical glass Class 01 Coatings containing quartz for optical glass 2393 用于光学玻璃的含石英涂层 Chinese 用于光学玻璃的含石英涂层 English Coatings containing quartz for optical glass Site ref. 2393 Class 01 Included in Harmonised Database (HDB)