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US Patent: 81,878
Improvement in steam safety-valves
Patentees: Everett Clemens (exact or similar names) - New York, NY Gilbert H. Clemens (exact or similar names) - New York, NY USPTO Classifications: 137/534 Tool Categories: propulsion and energy : steam apparatus : steam safety valves Assignees: None Manufacturer: Not known to have been produced Witnesses: George D. Walker Charles H. Smith	Patent Dates: Granted: Sep. 08, 1868 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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