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US Patent: 452,520
Explosive Engine
Patentee: August Harding (exact or similar names) - Oakland, Alameda County, CA USPTO Classifications: 123/153, 123/163, 123/348, 123/88 Tool Categories: propulsion and energy : internal combustion engines : ignition systems Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 10, 1890 Granted: May 19, 1891 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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