(based on 1(a)) Maintenance of valves, expansion and dilation joints for use in the energy sector; (based on 44 (e)) maintenance and construction of valves, expansion and dilation joints for use in the energy sector

PROCESS ENGINEERING SYSTEMS CONSISTING OF PNEUMATIC MACHINES FOR BLENDING, CONVEYING, AND SEPARATING PULVERULENT MATERIALS; MACHINES FOR RECOVERING HEAT FROM PULVERULENT MATERIALS; MACHINES FOR COMBUSTING PULVERULENT MATERIALS; CRUSHING AND GRINDING MACHINES FOR PRODUCING PULVERULENT MATERIALS; AND AIR SEPARATING, COOLING, AND HEAT TREATING MACHINES, SOLD AS A UNIT, FOR PROCESSING PULVERULENT MATERIALS; AND VALVES FOR CONTROLLING THE FLOW OF GASES IN INDUSTRIAL PROCESSING MACHINES