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US Patent: 1,980,336
Chuck Retaining Means
Patentee: Frank O. Hoagland (exact or similar names) - West Hartford, Hartford County, CT USPTO Classifications: 279/6, 279/97, 403/320, 74/568R, 82/147 Tool Categories: metalworking machines : metal lathes : metal lathe chucks Assignees: Pratt & Whitney Co. - Hartford, Hartford County, CT Manufacturer: Pratt & Whitney Co. - Hartford, Hartford County, CT Witnesses: Unknown	Patent Dates: Applied: May 17, 1933 Granted: Nov. 13, 1934 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Pratt, Whitney & Co.

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