7 Clamping devices for use with machine tools; machine parts, namely, tighteners; machine tools, namely, clamping towers for use in the precision clamping of work pieces; chucks for power drills; machine parts, namely, mandrels; membrane clamping devices for machine tools, namely, diaphragm chucks; hydraulic expansion devices for machine tools, namely, hydraulic expansion mandrels; centering devices, namely, centering drilling bits being parts of machines; flat clamping devices for machine tools, namely, plane clamping chucks and mandrels; vacuum clamping devices for machine tools, namely, vacuum chucks and mandrels; machine tool vacuum clamping devices, namely, vacuum chucks and mandrels; spindles for machine tools; spindle assemblies for machines; spindle shafts being parts of machines; tools for machine tools for cutting and forming of materials; air-powered tools, namely, chucks and mandrels; hydraulic actuated tools, namely chucks, mandrels and fixtures; power operated metalworking machine tools, namely, boring tools; lathes; milling cutters; machine tools for cutting and forming materials; electric welding machines for welding metal and plastic materials; central turning spindles being parts of machines; conveyor pressing machines; console clamping devices for machine tools, namely, chucks, mandrels and fixtures; machine tools, namely, vice clamps used for chucks, mandrels and fixtures; moulded collet chucks being parts of machines for chucks, mandrels and fixtures; measuring chucks, namely, chucks for power drills; precision clamping devices being parts of machines, namely, chucks, mandrels and fixtures; machine tool centering devices for workholding; metalworking machine tools and machine components therefore; flat machine tool clamping devices, namely, chucks, mandrels and fixtures