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US Patent: 1,501,252
Thread Milling Machine
Patentee: George T. Trundle, Jr. (exact or similar names) - Cleveland, Cuyahoga County, OH USPTO Classifications: 29/38B, 409/73, 409/77 Tool Categories: metalworking machines : metal threading machines : thread hobbing and thread milling machines Assignees: Pratt & Whitney Co. - Hartford, Hartford County, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 01, 1920 Granted: Jul. 15, 1924 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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