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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)
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