DOCKLOCK

machine tools, namely, clamps for use in the precision clamping of workpieces and tools; machine tools, namely, in particular three-jaw chucks for use in the precision clamping of workpieces, four-faced clamps for use in the precision clamping of workpieces, chucks for use in the precision clamping of workpieces, clamping vices and parts therefor for use in the precision clamping of workpieces, receiving mandrels, expanding mandrels, and clamping sleeves and parts therefor, all being parts of machines; zero point clamping systems comprised of metal clamps used for holding piece parts on machine tool tables; tool changing apparatus and workpiece feed apparatus, namely, electric tool changing machines for changing clamp heads and workpieces being parts of machine tools