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CA Patent: CA-13,718
Improvements on Safety Valves Perfectionnements aux Soupapes de Sûreté
Patentee: Henry George Ashton (exact or similar names) - Somerville, Middlesex County, MA USPTO Classifications: Tool Categories: propulsion and energy : steam apparatus : steam safety valves Assignees: None Manufacturer: Ashton Valve Co. - Boston, Middlesex County, MA Witnesses: John R. Snow George W. Guttet George O. Joule	Patent Dates: Applied: Sep. 07, 1880 Granted: Nov. 19, 1881 Patent Pictures: CIPO Data Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Ashton Valve Co.

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