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US Patent: 424,183
Reversing-valve for steam-engines
Patentees: Joseph W. Dennis (exact or similar names) - Buffalo, NY Frank A. Shoemaker (exact or similar names) - Buffalo, NY USPTO Classifications: 91/13, 91/180 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: None Manufacturer: Not known to have been produced Witnesses: F. C. Geyer Alice G. Connelly	Patent Dates: Applied: Aug. 26, 1889 Granted: Mar. 25, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for J. W. Dennis

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