7 Clamps and vices for use in the precision clamping of work pieces, namely, grippers being parts of machines; parts for industrial robots, namely, mechanical gripping devices for workpieces and tools, in particular electric, magnetic, pneumatic, hydraulic and spring-activated, gripping devices using negative pressure and parts therefor; clamps and vices for use in the precision clamping of work pieces, namely, parallel grippers, centric grippers, angular grippers, radial grippers, the aforesaid goods in the form of parts of machines; machine tools in the nature of clamps, vices, and jaws for use in the precision clamping of work pieces, namely, vice clamps and gripping jaws, in particular top jaws, pendulum jaws, plier jaws for mechanical tensioning and gripping devices, the aforesaid goods in the form of parts of machines; machine tools in the nature of clamps and jaws for use in the precision clamping of work pieces, namely, mechanical jaw changers for clamping and gripping devices and parts therefor; industrial robots, namely, robots being machines used in particular in industry, service robots, robots with articulated arms for handling workpieces and tools, as well as parts therefor; machinery for vacuum technology, namely, vacuum suction cups being air suction machines and parts therefor; machine tools in the nature of clamps, vices, and jaws for use in the precision clamping of work pieces, namely, grippers; elevating apparatus, namely, elevators; lifting apparatus, namely, elevators; retaining apparatus, namely, metal clamps used for holding piece parts on machine tool tables