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US Patent: 257,530
Steam Slide Valve
Patentee: Benjamin F. Sturtevant (exact or similar names) - Boston, MA USPTO Classifications: 137/625.66, 91/466 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: None Manufacturer: Not known to have been produced Witnesses: W. H. Allen Elmer P. Howe	Patent Dates: Applied: Feb. 25, 1882 Granted: May 09, 1882 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for B. F. Sturtevant

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