EU Trademark Classification EU11 Lighting, heating and air conditioning Heat exchangers for the removal of flue gases Class 11 Heat exchangers for the removal of flue gases 29531 排除烟气用热交换器 Chinese 排除烟气用热交换器 English Heat exchangers for the removal of flue gases Site ref. 29531 Class 11 Included in Harmonised Database (HDB)