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US Patent: 197,072
Improvement in Safety-Valves
Patentees: Henry G. Ashton (exact or similar names) - Boston, MA James E. Maynadier (exact or similar names) - Boston, MA USPTO Classifications: 137/614.2 Tool Categories: propulsion and energy : steam apparatus : steam safety valves Assignees: Henry G. Ashton - Boston, MA Charles J. Bishop - Boston, MA Manufacturer: Ashton Valve Co. - Boston, MA Witnesses: J. E. Knox B. A. Davis	Patent Dates: Applied: Jun. 24, 1876 Granted: Nov. 13, 1877 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Ashton Valve Co.

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