Cages of metal sold as components of machines and machine conveyors; rolling bearing cages, namely, ball and roller bearing retainers and ball and roller separators used in ball and roller bearings sold as component parts of machine part ball or roller bearings; rolling bearings for machines; bearings for engines; bearings for machines; bearings for shafts being parts of machines; machine components, namely, self-oiling bearings; ball bearings for machines; ball bearings for motors; ball bear...