xxxx Chinese companies including the xxx business office and building materials Machinery Co., Ltd. xxxx. xxx as a representative office in China's external xxx windows xxx imported equipment is responsible for the business contact, the user build the project technical advisory and xxx domestic equipment sales promotion work. xx Building Materials Machinery Co., Ltd. are xxx Mechanical Engineering Co., Ltd. a wholly-owned subsidiary in China, are the industry's first foreign-owned companies, are xxx members, was founded in 1997.  ......