7 Air filters for mechanical purposes; Compressed air machine components, namely, cylinders, valves and air grips; Couplings for machines; Cylinders for machines; Hydraulic valve actuators; Hydraulic valves being parts of machines; Hydraulic linear actuators, other than for land vehicles; Pneumatic linear actuators, other than for land vehicles; Machine parts, namely, joints and joint parts for connecting sliding strips, plates and guides; Metal clamps used for holding piece parts on machine tool tables; Oil filters for mechanical purposes; Parts for compressed-air tools, namely, brakes, filters, hoses, pipes, couplings valves, switches, compressors, clamping tools and injectors; Pistons for engines; Pneumatic air preparation equipment, namely, airline filters, lubricators, and regulators, all being parts of machines; Pneumatic valve actuators; Pressure regulators being parts of machines; Pump control valves; Regulators being parts of machines; Shaft bearings for vacuum pumps; Shock absorbers for machines; Thermostatic control valves for machines; Valves being parts of machines operated pneumatically and by air; Valves as machine components; Shaft couplings for machines; Hydraulic pumps; Valves being parts of machines; Connecting rods for machines, motors and engines; Cylinders for machines; Hydraulic valves being parts of machines; Proportional flow valves as parts of machines; Door openers, pneumatic; Window openers, electric; Window openers, pneumatic; Machine parts, namely, cylinders