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DE Patent: DE-6,870
Neuerungen an Rotierenden Maschinen Innovations to Rotating Machines
Patentee: A. S. Dolgorouky (exact or similar names) - St. Petersburg, Russia USPTO Classifications: Tool Categories: propulsion and energy : steam apparatus : rotary steam engines Assignees: None Manufacturer: Unknown Witnesses: Unknown	Patent Dates: Applied: Oct. 04, 1878 Granted: Aug. 22, 1879 Patent Pictures: Espacenet patent Report data errors or omissions to steward Joel Havens
Description: This is a German patent. There is a Dolgorouki Rotary Engine in the Vienna Technological Museum.

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