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US Patent: 439,349
Slide-valve for steam-engines
Patentee: Noble T. Greene (exact or similar names) - Providence, RI USPTO Classifications: 251/282, 251/319 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: None Manufacturer: Providence Steam Engine Co. - Providence, RI Witnesses: W. H. Thurston S. J. Murphy	Patent Dates: Applied: Jul. 28, 1888 Granted: Oct. 28, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Providence Steam Engine Co.

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