Machine tools for forming, shaping or machining metal and plastic or other rigid materials by cutting, boring, grinding, sharpening or finishing, milling machines, drilling machines, copying machines, namely, machine tools for machining metal, which copies the form of a sample item to a workpiece; and turning machines in the nature of power operated metalworking machine tools, namely, turning tools; tool turrets and tool disc turrets used to allow equipment to carry multiple cutting tools at one time and mount individual tools in the correct sequence; structural parts for the aforesaid machines and turrets, namely, hydraulic and electromechanical constant and variable speed drives, for machines and positioning devices for positioning a workpiece in the nature of vices, clamps and jaws for use in the precision clamping of work pieces; rotary indexing tables; tool stores, namely, tool magazines; tool holders, tool and workpiece positioning devices, and workpiece holders in the nature of clamps for use in the precision clamping of workpieces, power tool, namely, an interchangeable chuck used for cutting, boring, grinding, sharpening or finishing tools; power tools, namely, drill presses, grinders, power drills, jigsaws, circular saws, assembly tools for screws and nuts, namely, electric screwdrivers and bits for power drills