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US Patent: 1,865,560
Pop Valve
Patentee:
George B. Duffield (exact or similar names) - Detroit, Wayne County, MI

USPTO Classifications:
137/522, 137/54

Tool Categories:
propulsion and energy : steam apparatus : steam safety valves

Assignees:
Detroit Lubricator Co. - d, MI

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Jan. 29, 1926
Granted: Jul. 05, 1932

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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