Agreement between Champion Spark Plug Company Ceramic Division and International Union, United Automobile, Aerospace and Agricultural Implement Workers of America, (UAW-CIO), Local Union 272; Effective August 22, 1951
Agreement between Champion Spark Plug Company Ceramic Division Detroit Plant and International Union, United Automobile, Aerospace and Agricultural Implement Workers of America, Local Union 272; Effective February 1, 1971
Agreement between Champion Spark Plug Company Ceramic Division Detroit Plant and International Union, United Automobile, Aerospace and Agricultural Implement Workers of America, Local Union 272; Effective: February 1, 1968