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US Patent: 2,464,156
Expanding Chuck or Mandrel
Patentees: Gerald L. Sandersen (exact or similar names) - Essex, Middlesex County, CT Karl K. Nielsen (exact or similar names) - Essex, Middlesex County, CT Colin Campbell (exact or similar names) - Essex, Middlesex County, CT USPTO Classifications: 279/2.03, 279/2.12, 82/161 Tool Categories: work holding : vises : metalworking machine vises Assignees: Gerald L. Sandersen - Essex, Middlesex County, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 20, 1946 Granted: Mar. 08, 1949 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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