Manufacturing, research, and development of gas equipment, gas pressure regulating devices, and compressed natural gas storage skids; manufacturing and sales of liquefied petroleum gas gasification equipment, liquefied petroleum gas mixing equipment, pressure regulating boxes, mobile pressure regulating stations, explosion-proof electric heaters, electric heating pipes, hydraulic-boosted compressed natural gas vehicle refueling substation equipment, and liquefied natural gas vehicle refueling device equipment; mechatronics, automatic