7 Machine tools, for forming, shaping or machining metal or plastic or other rigid materials by cutting, boring, grinding, sharpening or finishing; milling, drilling, copying and turning machines, tool turrets and tool disc turrets; replacement and structural parts for the aforesaid machines and turrets, in particular electric, hydraulic and electromechanical drives, positioning devices, gears, couplings, fluid valves, hydraulic and pneumatic and lubricant-dispensing units; Rotary indexing tables; tool stores, namely, tool magazines; machine tool holders; machine tool and work piece positioning holders; workpiece holders being parts of machines, interchangeable chucks for machines excluding land vehicles; 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 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 and mechanically driven devices for retaining, tensioning and gripping workpieces; Operating devices being parts of machines for the aforesaid machines