Research, development, design, and sales of aerospace equipment, petroleum machinery, marine machinery, special vehicles, metallurgical equipment, ball cage universal couplings, cross shaft universal couplings, drum gear couplings, ultra-high-speed precision couplings, and non-standard bearings. Licensed items: technology import and export; import and export of goods; import and export agency; research, development, and production of weapons and equipment. General items: manufacturing of general equipment (excluding special equipment manufacturing); manufacturing of special equipment for geological exploration; manufacturing of high-speed rail equipment and parts; manufacturing of metallurgical special equipment; manufacturing of special equipment (excluding licensed special equipment manufacturing); manufacturing of special equipment for oil drilling; manufacturing of mining machinery.