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US Patent: 138,828
Improvement in rotary valves for steam-engines
Patentee: George Westinghouse, Jr. (exact or similar names) - Pittsburgh, PA USPTO Classifications: 137/625.24, 335/269 Tool Categories: propulsion and energy : steam engines Assignees: None Manufacturer: Not known to have been produced Witnesses: G. H. Christy A. S. Nicholson	Patent Dates: Applied: Feb. 15, 1873 Granted: May 13, 1873 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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