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US Patent: 442,640
Regulator for grain-scales
Patentee: Francis H. Richards (exact or similar names) - Hartford, CT USPTO Classifications: 177/123, 177/65 Tool Categories: Assignees: Pratt & Whitney Co. - Hartford, CT Manufacturer: Not known to have been produced Witnesses: Henry L. Reckard W. M. Byorkman	Patent Dates: Applied: Apr. 25, 1889 Granted: Dec. 16, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Pratt & Whitney Co.

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