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US Patent: 275,431
Metal Screw Machine
Patentee: Christopher M. Spencer (exact or similar names) - Hartford, Hartford County, CT USPTO Classifications: 470/58, 470/60, 470/62 Tool Categories: metalworking machines : screw machines Assignees: Hartford Machine Screw Co. - Hartford, Hartford County, CT Manufacturer: Pratt & Whitney Co. - Hartford, Hartford County, CT Witnesses: Theodore G. Ellis Edwin F. Dimock Walter H. Bunce	Patent Dates: Applied: Aug. 26, 1882 Granted: Apr. 10, 1883 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Pratt, Whitney & Co. Christopher Miner Spencer, 19th-century Arms Manufacturer
Description: The Pratt & Whitney Co. made these machines for the Hartford Screw Machine Co.

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