23 Bench or Pedestal Supported or Machine Mounted, Power Operated Small Parts Handling Machines Including: Single Parts Feeding and Orienting Hopper Units; Single or Multiple Parts Feeding, Orienting and Assembling Units with Screw, Nut or Stud Driving Mechanisms and Stationary or Indexing Work Holding Fixtures, and Repair and Replacement Parts Therefor; and Power Operated Large and Small Parts Elevating Feeders for Supplying Such Parts to Numerous Types of Primary and Secondary Work Performing Machines, and Repair and Replacement Parts Therefor