universal joints for machine parts; joints as machine parts and component machine parts used for repair and replacement of drive shafts and prop shafts for machines, namely, universal joints, companion flanges, flange yokes, slip yokes, end yokes, center and tube yokes, shafting, tubing, yoke and tube assemblies comprised of a yoke and tubes, stub shafts, yoke shafts, double cardan constant velocity assemblies comprised of two double cardan joints, an h-yoke, a ball socket yoke and a ball-stu...