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US Patent: 181,334
Improvement in balanced valves
Patentee: Leonard H. Hall (exact or similar names) - Erie, PA USPTO Classifications: 251/187, 251/282 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: None Manufacturer: Bay State Iron Works - Erie, PA Witnesses: John K. Hallock J. J. Read	Patent Dates: Applied: Feb. 28, 1876 Granted: Aug. 22, 1876 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Bay State Iron Works
Description: The inventor was partner in Noble & Hall, operators of steam-engine maker Bay State Iron Works.

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