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US Patent: 102,078
Improved process for facing valves and valve-seats for steam-engines
Patentee: Quimby S. Backus (exact or similar names) - Winchendon, MA USPTO Classifications: 251/368, 29/888.46 Tool Categories: propulsion and energy : steam engines : steam engine valves Assignees: None Manufacturer: Not known to have been produced Witnesses: C. L. Evert A. N. Marr	Patent Dates: Granted: Apr. 19, 1870 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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