Machines and power-operated machine tools for treatment of materials and for manufacturing, namely, drill chucks being parts of machines, collets being parts of machines, push-type collets being parts of machines, clamping devices in the nature of clamps for use in the precision clamping of work pieces being parts of machine tools, clamping nuts being parts of machines, [ socket spanners being parts of machines, clamping sleeves being parts of machines; ] tapping chucks for powered machines f...