7 Machine tools for forming, shaping and machining metal, 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 work piece; metalworking turning machines; machine tool turrets and tool disc turrets; parts for the aforesaid machines and turrets, in particular electric, hydraulic and electromechanical motor drives, machine tool positioning devices, gears, couplings, fluid valves and hydraulic and pneumatic and lubricant-dispensing units, sold empty; rotary indexing tables; tool holders, machine tool and workpiece positioning units, workpiece holders being parts of machines; interchangeable chucks for use with machine tools; power tools being parts of machines, namely, motor-driven spindles with and without swiveling units; industrial robots for machine handling and positioning; industrial robots for separating, cutting, joining, welding, milling, deburring, grinding, peeling, rolling and polishing; machines for gripping, moving and positioning mechanical components, including workpieces and/or tools; tool changers being parts of machines for mechanical rotation, turning and lifting; machine parts in the nature of conversion apparatus and mechanically driven apparatus for retaining, tensioning and gripping workpieces