Air filters for mechanical purposes; Back pressure valves as parts of machines; Cylinders for machines; Exhaust pipes for land vehicles; Hydraulic engines and motors; Hydraulic valve actuators; Leveling mounts for machines; Machine parts, namely, joints and joint parts for connecting sliding strips, plates and guides; Oil filters; Parts for compressed-air machines, namely, pressure switches and sensors for monitoring, controlling, and switching hydraulic or pneumatic systems sold as an integral component of injection molding machines; Parts for pneumatic blow guns, namely, inflator tips, inflator valves, valve adapters, nozzles, nipples, couplers, connectors and pivots; Pneumatic controls for machines, motors and engines; Pneumatic piercing machinery and auxiliary supportive devices used in the installation or replacement of utility pipe lines, cable lines, pipe tunnels and underground utility systems; 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; Valves being parts of machines operated pneumatically and by air