| Cepsa Chemical (Shanghai) Co.,Ltd. | Manufacture petrochemicals (Phenol) in China | Mineral Resources, Energy, Chemical & Electronics | China |
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| Eastern Water Co., Limited | Waste Water Treatment | Infrastructure | Hong Kong |
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| Hangzhou Shansong Construction Machinery Sales Co.,Ltd. | Sale of Komatsu construction machinery | Transportation & Construction Systems | China |
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| Jilin Komatsu Construction Machinery Co., Ltd. | Sale of Komatsu construction machinery | Transportation & Construction Systems | China |
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| KIRIU LIOHO Company Limited | Automotive components manufacturer (Disc rotor, Brake drum, etc.) | Transportation & Construction Systems | China |
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| KIRIU SAMICK Co., Ltd. | Automotive components manufacturer (Disc rotor, Brake drum, etc.) | Transportation & Construction Systems | Korea |
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| KIRIU TECHNO (YANTAI) Co.,Ltd. | Automotive components manufacturer (Disc rotor, Brake drum, etc.) | Transportation & Construction Systems | China |
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| Mason Metal Industry Co., Ltd. | Steel service center (processing and sales) | Metal Products | Taiwan |
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| Nanjing CMSCL Co., Ltd. | Automobile related Transportation, warehousing & Distribution Services | Infrastructure | China |
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| Sanyou Drugstores, Ltd. | Drugstore Chain in Taiwan | Living Related & Real Estate | Taiwan |
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| SC Construction Machinery (Shanghai) Corporation | Sale of Komatsu construction machinery | Transportation & Construction Systems | China |
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| Shanghai Baosteel Summit Auto Trading Co., Ltd. | Dealership of motor vehicles | Transportation & Construction Systems | China |
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| Sichuan SC Construction Machinery Co.,Ltd. | Sale of Komatsu construction machinery | Transportation & Construction Systems | China |
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| Simple Mart Retail Co., Ltd. | Supermarket chain in Taiwan | Living Related & Real Estate | Taiwan |
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| Sumisho Global Logistics (China) Co., Ltd. (SGL China) | Global Logistics Services | Infrastructure | China |
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| Sumitomo Corporation Equity Asia | Venture investment in Asia | Media & Digital | Hong Kong |
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| Sumitronics Taiwan Co., Ltd. | Sale of electronics materials and parts | Mineral Resources, Energy, Chemical & Electronics | Taiwan |
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| Summit Agro China Co., Ltd | Distribution of crop protection products in China | Mineral Resources, Energy, Chemical & Electronics | China |
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| Summit Auto Parts Co., Ltd. | Sales of consumables/general repair parts primarily for mid- and top-range vehicles | Transportation & Construction Systems | China |
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| Summit Fertilizer (Foshan) Co., Ltd. | Manufacture and sale of chemical fertilizer in China | Mineral Resources, Energy, Chemical & Electronics | China |
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| Summit Fertilizer (Qingdao) Co., Ltd. | Manufacture and sale of chemical fertilizer in China | Mineral Resources, Energy, Chemical & Electronics | China |
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| Summit Pharmaceuticals China Limited | Supply of active pharmaceutical ingredients, intermediates | Mineral Resources, Energy, Chemical & Electronics | China |
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| Transwest Mongolia LLC | Sale of construction and mining machinery in Mongolia | Transportation & Construction Systems | Mongolia |
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| Wuhan Komatsu Construction Machinery Co., Ltd. | Sale of Komatsu construction machinery | Transportation & Construction Systems | China |
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| Xi'an Ansong Construction Machinery Co., Ltd. | Sale of Komatsu construction machinery | Transportation & Construction Systems | China |
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| Xiwang International Trade Co., Ltd | Import and distribution of feed grains | Living Related & Real Estate | China |
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| Zoro Shanghai Co.,ltd | E-commerce business with a focus on subsidiary materials for factories in China | Media & Digital | China |
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| 住商鋼鐵製品（香港）有限公司 | Shearing, slitting, and sale of steel sheets | Metal Products | China |
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| 上海頂鋒金属製品有限公司 | Shearing, slitting, and sale of steel sheets | Metal Products | China |
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| 上海日嘉金属制品有限公司 | Stock, sale, and processing of tool steel | Metal Products | China |
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| 中山高木汽車配件有限公司 | Manufacture and sales of pressed parts and molds for automobiles | Metal Products | China |
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| 中山市野村鋼材製品有限公司 | Steel service center (processing and sales) | Metal Products | China |
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| 天津華住金属制品有限公司 | Shearing, slitting, and sale of steel sheets | Metal Products | China |
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| 東莞頂鋒金属制品有限公司 | Steel service center (processing and sales) | Metal Products | China |
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| 無錫頂鋒日嘉金属制品有限公司 | Manufacture, processing and sales of tool steel and semi-finished molds | Metal Products | China |
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| 無錫宝美鋒金属加工配送有限公司 | Steel service center (processing and sales) | Metal Products | China |
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| 鈴木住電鋼綫制品（廣州）有限公司 | Manufacture and sales of stainless steel wires | Metal Products | China |
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| 佛山頂鋒日嘉模具有限公司 | Stock, sale, and processing of tool steel | Metal Products | China |
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| 广州日鉄鋼管有限公司 | Manufacture and sales of tubular products for automobiles, construction equipment and motorcycles | Metal Products | China |
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