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US Patent: 197,076
Balanced-Valve
Patentee: Robert W. Aitken (exact or similar names) - Buffalo, Erie County, NY USPTO Classifications: 137/625.25 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: Robert Dunbar - Buffalo, Erie County, NY George H. Dunbar - Buffalo, Erie County, NY Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 22, 1877 Granted: Nov. 13, 1877 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Buffalo Pitts Co.

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