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US Patent: 1,629,449
Valve Operating Device
Patentee: George B. Duffield (exact or similar names) - Detroit, Wayne County, MI USPTO Classifications: 16/432, 16/DIG.30, 251/291, 403/258 Tool Categories: hardware : valves Assignees: Detroit Lubricator Co. - Detroit, Wayne County, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Aug. 25, 1926 Granted: May 17, 1927 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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