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US Patent: 1,951,926
Relief Valve
Patentee: Kenneth S. M. Davidson (exact or similar names) - Newton Highlands, Middlesex County, MA USPTO Classifications: 137/71, 220/89.2, 361/521 Tool Categories: industrial tools : industrial valves Assignees: Crosby Steam Gage & Valve Co. - Boston, Suffolk County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 13, 1929 Granted: Mar. 20, 1934 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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