7 anti-friction pads for machines, bearing brackets for machines, bearings and ball rings for machines, bearings for transmission shafts, conveyors, air cushion devices; namely, pneumatic bearings for machines, anti-friction bearings for machines, ball rings for bearings, ball-bearings, machine tools; namely, drills, lathes, turrets, mills, planes, routers, cutters, rotary and band saws, metal working machines; namely, punches, presses, shears and extruders, pneumatic transporters; namely, pneumatically raised metal ball bearings in rail units for machines, pneumatic tube conveyors, roller bearings for machines, self-oiling bearings for machines