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US Patent: 247,588
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Patentee: Nelson W. Twiss (exact or similar names) - New Haven, CT USPTO Classifications: 91/254 Tool Categories: propulsion and energy : steam engines : steam engine valve gear transportation : railroads : railroad locomotives : steam engine valve gear Assignees: None Manufacturer: Nelson W. Twiss - New Haven, CT Witnesses: Anthony Gref, Jr. George H. Evans	Patent Dates: Applied: Jul. 28, 1881 Granted: Sep. 27, 1881 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Nelson W. Twiss
Description: Improvements to patent 212,285.

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