主营产品：Production, research and development, sales and related technical services of laser equipment, optical, mechanical and electrical equipment, instrumentation, electronic products, communication equipment; self-operated and agent import and export business of various commodities and technologies (but the state limits the company's operation or prohibits Excluding imported and exported goods and technology). (Projects with special national approval can only be operated after approval or with a valid license)
主营产品：Electricity and electronics, instruments and meters, connecting devices, mechanical tools, mechanical parts and safety supplies and hardware and chemicals
主营产品：Municipal engineering construction; processing, sales, installation and leasing of construction facilities and metal mobile homes; sales of hardware and construction materials
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