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US Patent: 69,527
Improvement in steam safety-valves
Patentees: John N. Wrigley (exact or similar names) - Newark, NJ George Smith (exact or similar names) - Newark, NJ USPTO Classifications: 137/469, 137/508, 251/282 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: John N. Wrigley - Newark, NJ Manufacturer: Not known to have been produced Witnesses: William F. McNamara Alexander F. Roberts	Patent Dates: Granted: Oct. 01, 1867 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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