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US Patent: 2,021,773
Relief Valve
Patentee: Perry H. Gentzel (exact or similar names) - Newton, Middlesex County, MA USPTO Classifications: 251/333, 251/360 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: Jun. 20, 1932 Granted: Nov. 19, 1935 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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