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CA Patent: CA-11,789
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 W. Guttet George O. Joule	Patent Dates: Applied: Sep. 07, 1880 Granted: Sep. 20, 1880 Patent Pictures: [ 1 | 2 | 3 ] CIPO Data Espacenet patent Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Ashton Valve Co.
Description: This is the Canadian equivalent of US patents 291,126 and 301,079.

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