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US Patent: 2,287,433
System for Safeguarding the Operation of Steam Boilers
Patentee: Erling Klafstad (exact or similar names) - Melrose, Middlesex County, MA USPTO Classifications: 122/479.1, 137/468, 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: Mar. 21, 1938 Granted: Jun. 23, 1942 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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