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US Patent: 91,337
Improvement in steam-engine stop-valves
Patentee: William H. Howland (exact or similar names) - San Francisco, CA USPTO Classifications: 251/309 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: None Manufacturer: Howland, Angell & King - San Francisco, CA Witnesses: J. L. Boone George H. Strong	Patent Dates: Granted: Jun. 15, 1869 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Howland, Angell & King

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