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US Patent: 1,890,601
Internal Combustion Indicator
Patentee:
Claude E. Cox (exact or similar names) - Detroit, Wayne County, MI

USPTO Classifications:
346/4, 346/44

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: Jul. 29, 1929
Granted: Dec. 13, 1932

Patent Pictures:
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