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US Patent: 1,393,258
Safety Valve
Patentee: Alfred B. Carhart (exact or similar names) - Winchester, Middlesex County, MA USPTO Classifications: 137/473, 137/491 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: Nov. 13, 1919 Granted: Oct. 11, 1921 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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