Air filters for mechanical purposes; Cylinders for machines; Fluid power component kit comprising hose and fittings for use in machinery; Horning machines for metalworking; Machine parts, namely, joints and joint parts for connecting sliding strips, plates and guides; Pistons for engines; Pistons for cylinders; Pneumatic controls for machines, motors and engines; Pneumatic pipe-bursting machinery and auxiliary supportive devices used in the installation or replacement of utility pipe lines, c...