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US Patent: 450,402
Machines for Boring the Valve-Boxes of Cylinders of Steam Engines
Patentees: George H. Corliss, deceased (estate of) (exact or similar names) - Providence, Providence County, RI Emily A. Corliss, administratrix (exact or similar names) - Providence, Providence County, RI USPTO Classifications: 144/99, 408/100 Tool Categories: metalworking machines propulsion and energy : steam engines : steam engine valves Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 21, 1889 Granted: Apr. 14, 1891 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Corliss Steam Engine Works
Description: Application renewed 06 Nov., 1890.

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