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US Patent: 1,949,930
Steam Valve
Patentee: Kenneth S. M. Davidson (exact or similar names) - Newton Highlands, Middlesex County, MA USPTO Classifications: 137/536, 137/543 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: Jul. 13, 1929 Granted: Mar. 06, 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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