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US Patent: 2,167,433
Air Vent Valve
Patentee: George B. Duffield (exact or similar names) - Detroit, Wayne County, MI USPTO Classifications: 137/201, 137/553, 236/63, 251/121, 251/219, 251/286 Tool Categories: hardware : valves specialty machines : heating apparatus Assignees: Detroit Lubricator Co. - Detroit, Wayne County, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 04, 1936 Granted: Jul. 25, 1939 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Detroit Lubricator Co.

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