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US Patent: 447,535
Rotary Engine
Patentees: William G. Billings (exact or similar names) - Larned, Pawnee County, KS Avery W. Billings (exact or similar names) - Larned, Pawnee County, KS USPTO Classifications: 418/144 Tool Categories: propulsion and energy : steam apparatus : rotary steam engines Assignees: William G. Billings - Larned, Pawnee County, KS Avery W. Billings - Larned, Pawnee County, KS Arthur T. Billings - Larned, Pawnee County, KS Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jun. 23, 1890 Granted: Mar. 03, 1891 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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