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Detroit Historical Society
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Grand Valley State University. University Libraries
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Champion Spark Plug Co.
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Industrial History
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eng
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Patents
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Champion Spark Plug Co.
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Rotary Ovens
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1.
Portion of a patent filing mounted on board, for a furnace for decorating ceramic ware, invented by J
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Assignment Before Patent
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Assignment Before Patent
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Portion of a patent filing mounted on board, for a furnace for decorating ceramic ware
5.
Joseph E. Bradford from Horatio T. Libby
