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US Patent: 905,476
Rotary Engine
Patentees: Fredrick Stoehr (exact or similar names) - Minneapolis, Hennepin County, MN Elmer W. Gragert (exact or similar names) - Minneapolis, Hennepin County, MN USPTO Classifications: 418/211, 418/219 Tool Categories: propulsion and energy : steam apparatus : rotary steam engines Assignees: Duplex Rotary Engine Co. - Minneapolis, Hennepin County, MN Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jun. 23, 1906 Granted: Dec. 01, 1908 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Duplex Rotary Engine Co.

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