Air filters for mechanical purposes; Back pressure valves as parts of machines; Cylinders for machines; Fuel filters; Horning machines for metalworking; Hydraulic controls for machines, motors and engines; Hydraulic valve actuators; Hydraulic valves being parts of machines; Leveling mounts for machines; Machine parts, namely, joints and joint parts for connecting sliding strips, plates and guides; Mufflers for motors and engines; Oil filters; Pistons for engines; 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; Radiators for vehicles; Springs being parts of machines; Strapping machines; Taps being parts of machines, engines or motors