COLUMBUS, I. - Today Cummins Inc. (NYSE: CUM) announced that it has shipped the first of its on-highway engines certified by the Environmental Protection Agency (EPA) to the 2.5-gram NOx + NMHC ...
If it hadn't been for the development of copper zeolite as a catalyst to use in reducing nitrogen oxides (NOx), Cummins might have been right alongside Navistar in using increased levels of exhaust ...
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