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US Patent: 2,365,227
Engine Operation Analyzer
Patentee: Charles Unterberg (exact or similar names) - Osborn, Greene County, OH USPTO Classifications: 346/129, 346/4, 73/114.18 Tool Categories: propulsion and energy : internal combustion engines : internal combustion engine indicators Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 11, 1943 Granted: Dec. 19, 1944 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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