Air filters for mechanical purposes; Back pressure valves as parts of machines; Components for machines and machine tools, grinding machines, material handling machines, food processing machines, chemistry processing machines and textile industry machines, namely, sand, chemical and reverse osmosis filters; Components for machines and machine tools, namely, sand, chemical and reverse osmosis filters; Compressed air machine components, namely, cylinders, valves and air grips; Compressed air machines; Cylinders for machines; Exhaust pipes for land vehicles; Horning machines for metalworking; Hydraulic controls for machines, motors and engines; Hydraulic valve actuators; Leveling mounts for machines; Mufflers for motors and engines; Pneumatic pipe-bursting machinery and auxiliary supportive devices used in the installation or replacement of utility pipe lines, cable lines, pipe tunnels and underground utility systems; Taps being parts of machines, engines or motors