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US Patent: 479,273
Piston-valve
Patentee: Martin E. Hershey (exact or similar names) - Harrisburg, PA USPTO Classifications: 137/625.48 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: None Manufacturer: Harrisburg Foundry & Machine Works - Harrisburg, PA Witnesses: B. Edward Taylor S. W. Fleming	Patent Dates: Applied: Apr. 11, 1892 Granted: Jul. 19, 1892 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Harrisburg Foundry & Machine Works

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