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Sinoma International Engineering Co Ltd (Sinoma), a subsidiary of China National Building Material Co Ltd, is a provider of general contracting services to the cement industry. The company's service portfolio includes engineering consultancy, engineering design, general contracting, construction, erection, commissioning, operation and ...About Us. More. Sinoma International Engineering Co., Ltd, Overseas Development Branch ( Sinoma Overseas For Short) established in 1988, the branch of the state-owned publicly held company, Sinoma International Engine... >>. Online Inquiry Contact Us.