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US Patent: 1,719,801
Valve
Patentee: George B. Duffield (exact or similar names) - Detroit, Wayne County, MI USPTO Classifications: 251/220, 251/286, 411/411, 411/417 Tool Categories: hardware : valves Assignees: Detroit Lubricator Co. - Detroit, Wayne County, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 10, 1926 Granted: Jul. 02, 1929 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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