EU Trademark Classification EU09 Scientific and electronic apparatus Electro-optical couplers Class 09 Electro-optical couplers 21524 电光耦合器 Chinese 电光耦合器 English Electro-optical couplers Site ref. 21524 Class 09 Included in Harmonised Database (HDB), Nice Alphabetical List, WIPO Madrid Goods and Services (MGS)