Valves [parts of machines]; lubricators [parts of machines]; clack valves [parts of machines]; jacks [machines]; pressure reducers [parts of machines]; pistons for cylinders; regulators [parts of machines]; pistons [parts of machines or engines]; presses [machines for industrial purposes]; industrial machine presses; pressure regulators [parts of machines]; pressure valves [parts of machines]; compressed air engines; compressed air machines; compressed air pumps; filters [parts of machines or engines]; hydraulic controls for machines, motors and engines; pneumatic controls for machines, motors and engines; pneumatic jacks.