Universal joints being machine parts in the nature of cardan joints for connecting sliding strips, plates and guides; transmission shafts, other than for land vehicles; anti-friction bearings for machines; roller bearings for machines; ball rings for bearings for machines, namely, automobiles, dynamos; bearings for transmission shafts, being parts of machines; bearings as parts of machines; bearing brackets for machines; self-oiling bearings as parts of machines; ball bearings for use in mach...