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US Patent: 331,858
Balanced Slide Valve
Patentee: Daniel A. Woodbury (exact or similar names) - Rochester, Monroe County, NY USPTO Classifications: 91/241 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 02, 1885 Granted: Dec. 08, 1885 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Woodbury, Booth & Co.

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