Research, development, manufacturing, and sales: Aerospace special equipment, parts and related materials; Mechanical and electronic parts and products; Optoelectronic integrated equipment; Automatic control equipment; Instruments and meters; Medical device accessories; Fasteners; Connectors; Sensors; Wire harnesses, cables and their assemblies; Lightning protection equipment; Molds; Sheet metal stamping parts; Bore inspection instruments; Communication equipment; Vehicle wireless video instruments; Equipment safety warning devices; Metal surface treatment (excluding electroplating); Heat treatment; And trade operations of the above products; Self-operated and agent import and export of various goods and technologies (excluding goods and technologies restricted or prohibited by the state).