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US Patent: 402,510
Valve Operating Mechcanism for Grain Scales
Patentee: Charles H. Cooley (exact or similar names) - Hartford, Hartford County, CT USPTO Classifications: 177/123 Tool Categories: agricultural : grain scales Assignees: Pratt & Whitney Co. - Hartford, Hartford County, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Nov. 12, 1888 Granted: Apr. 30, 1889 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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