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US Patent: 147,993
Balanced Slide Valve
Patentee: Edward D. Speer (exact or similar names) - Brookville, Franklin County, IN USPTO Classifications: 137/625.25 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jan. 03, 1874 Granted: Feb. 24, 1874 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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