Tianjin Master Co.,Ltd.   Tianjin Institudes for Drug Control   Henan Richwoll Chemical Co.,Ltd   Tianjin Kelioil Engineering Material and Technology Co.,Ltd   Tianjin Baitu Chemical Co.Ltd   tianjin yeats technology&chemical co.,ltd.   Nanjing RICHEN SATICHEM CO LTD   Xinxiang Richful Lube Additive Co., Ltd.   Emmeriche Chemical Exports   Tianjin zongyan techonlogy Co,.Ltd   tianjin dongshen international trading co.,ltd   Sigma Aldrich Ireland Ltd   QINGDAO FULLRICH INTERNATIONAL TRADE CO.,LTD   Tianjin Dalipu Oil Country Tubular Goods Co., Ltd   Shanghai Rich Group Limited   Tianjin Botongda Energy Technology Co.,Ltd   Tianjin Chempharmatech Co.,Ltd.   Tianjin Chempharmatech Co.,Ltd.   Richfield Industries   Humate（Tianjin）international limted