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 ]