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US Patent: 3,072,416
Force Amplifying Collet Chuck
Patentee: Lorenz A. Leifer (exact or similar names) - Madison, Dane County, WI USPTO Classifications: 279/4.09 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: May 31, 1961 Granted: Jan. 08, 1963 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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