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US Patent: 1,231,330
Safety Valve
Patentee: George H. Clark (exact or similar names) - Cambridge, Middlesex County, MA USPTO Classifications: 137/478 Tool Categories: propulsion and energy : steam apparatus : steam safety valves Assignees: Crosby Steam Gage & Valve Co. - Boston, Suffolk County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 31, 1915 Granted: Jun. 26, 1917 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Crosby Steam Gage & Valve Co.

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