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US Patent: 504,172
Roll Grooving Machine
Patentees: Francis A. Pratt (exact or similar names) - Hartford, CT John Johnson (exact or similar names) - Hartford, CT USPTO Classifications: 409/305 Tool Categories: metalworking machines : metal planers Assignees: Pratt & Whitney Co. - Hartford, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 17, 1893 Granted: Aug. 29, 1893 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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