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US Patent: 73,069
Improvement in valve-gear
Patentee: John F. Allen (exact or similar names) - New York, NY USPTO Classifications: 12/146C, 91/259, 91/333 Tool Categories: propulsion and energy : steam engines : steam engine valve gear Assignees: None Manufacturer: Porter-Allen Engine Co. - New York, NY Witnesses: J. W. Coombs G. W.Reed	Patent Dates: Granted: Jan. 07, 1868 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Porter-Allen Engine Co.

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