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US Patent: 2,183,650
Relief Valve
Patentees: Erling Klafstad (exact or similar names) - Melrose, Middlesex County, MA Gordon L. Gundersen (exact or similar names) - Wollaston, Norfolk County, MA USPTO Classifications: 137/468, 137/469, 236/92R 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. 16, 1937 Granted: Dec. 19, 1939 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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