Topic: Patents - Michigan Digital Library Portal - Michigan Memories Search Results

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Institution

Detroit Historical Society4
Grand Valley State University. University Libraries1

Collection

Champion Spark Plug Co.1
Industrial History1

Language

eng1

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text3

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Patents[remove]5
Champion Spark Plug Co.2
Rotary Ovens2
Engines1
Machinists1
New York (N.Y.)1
Portland (Me.)1
United States. Patent Office1

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Patent2

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