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US Patent: 421,556
Automatic regulator for grain-scales
Patentee: Charles H. Cooley (exact or similar names) - Hartford, CT USPTO Classifications: 222/56, 241/34 Tool Categories: Assignees: Pratt & Whitney Co. - Hartford, CT Manufacturer: Not known to have been produced Witnesses: Francis H. Richards Samuel W. Powell	Patent Dates: Applied: Feb. 03, 1888 Granted: Feb. 18, 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.
Description: A companion patent to 403,988.

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