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US Patent: 1,818,305
Collet Chuck
Patentee: George M. Class (exact or similar names) - Madison, Dane County, WI USPTO Classifications: 279/146, 279/46.7, 279/55 Tool Categories: metalworking machines : metal lathes : metal lathe chucks Assignees: Gisholt Machine Co. - Madison, Dane County, WI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 16, 1929 Granted: Aug. 11, 1931 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Gisholt Machine Co.

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