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- Description:
- Portion of a patent filing mounted on board, for a furnace for decorating ceramic ware, invented by J.A. Jeffery and filed April 18, 1921. Depicted is a numbered diagram. Dated Sept. 25, 1923. Patent number 1,468,947.
- Date Issued:
- 1923-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Collection:
- Champion Spark Plug Co.
- Description:
- Black and white photographic print mounted on fabric depicting a Dressler kiln control panel in the operator room at the Champion Spark Plug Co. Caption on verso reads: Taken for Dressler Co. March 1921.
- Date Issued:
- 1921-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Collection:
- Champion Spark Plug Co.
- Description:
- Black and white photographic print mounted on fabric depicting a Jeffery Dewitt Kiln under construction at the Champion Porcelain Co. Dated Nov-18-1921
- Date Issued:
- 1921-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Collection:
- Champion Spark Plug Co.
- Description:
- Black and white photographic print depicting equipment in the product testing laboratory at the Champion Spark Plug Co. Caption on verso reads, "Product Testing Laboratory. From left to right are shown an impact testing machine from completely assembled spark plugs, an intermittent heat shock testing device, a modified Olsen tensile strength machine, the electric furnace and recorders for determining the temperature-electrical resistivity curve for assembled spark plugs, and a falling-weight impact tester for cores."
- Date Issued:
- 1922-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Collection:
- Champion Spark Plug Co.
- Description:
- Black and white photographic print mounted on fabric depicting the cooling end of a Jeffery Dewitt Kiln under construction at the Champion Porcelain Co. Dated May 25th 1919.
- Date Issued:
- 1919-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Collection:
- Champion Spark Plug Co.
- Description:
- Black and white photographic print mounted on fabric depicting the cooling end a Jeffery Dewitt Kiln under construction at the Champion Porcelain Co. Dated 5-9-1919.
- Date Issued:
- 1919-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Collection:
- Champion Spark Plug Co.
- Description:
- Black and white photographic print mounted on fabric depicting the cooling end of a Jeffery Dewitt Kiln under construction at the Champion Porcelain Co. Dated 3-28-1919.
- Date Issued:
- 1919-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Collection:
- Champion Spark Plug Co.
- Description:
- Black and white photographic print depicting a room of women operating turning machines at the Champion Spark Plug Co.
- Date Issued:
- 1922-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Collection:
- Champion Spark Plug Co.
- Description:
- Black and white photographic print mounted on board depicting a laboratory at the Champion Spark Plug Co. The image is highlighted for reproduction in publications.
- Date Issued:
- 1915-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Collection:
- Champion Spark Plug Co.
- Description:
- Black and white photographic print mounted on fabric depicting the inside of a Jeffery Dewitt Kiln under construction at the Champion Porcelain Co., looking toward the head end. Dated July 7th 1919.
- Date Issued:
- 1919-01-01T00:00:00Z
- Data Provider:
- Detroit Historical Society
- Collection:
- Champion Spark Plug Co.
