EU Trademark Classification EU01 Chemicals Additives (Chemical -) for use in drilling fluids Class 01 Additives (Chemical -) for use in drilling fluids 960 钻井液用化学添加剂 Chinese 钻井液用化学添加剂 English Additives (Chemical -) for use in drilling fluids Site ref. 960 Class 01 Included in Harmonised Database (HDB)