R&D, production and sales of rock drilling machinery, rock electric drills, mining electrical appliances, wind turbine accessories, bearings and bearing accessories, basic couplings, pneumatic tools, machine tool accessories, motorcycle accessories, electric fans, various casting products, road maintenance machinery, and mechanical and electrical equipment. Operating the export business of the company’s self-produced mechanical and electrical products and complete sets of equipment; importing the company’s raw and auxiliary materials, mechanical and electrical equipment, instruments and measuring tools required for scientific research (operated with an import and export qualification certificate); leasing facades and factory buildings.