EU Trademark Classification EU09 Scientific and electronic apparatus 氧气面罩（医用除外）（23411） Class 09 氧气面罩（医用除外） 23411 Chinese 氧气面罩（医用除外） English Oxygen masks, not for medical use Site ref. 23411 Class 09 Included in Harmonised Database (HDB), WIPO Madrid Goods and Services (MGS)