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The only significant infringement case involving Edison's ore milling patents occurred in 1909. Edison v. Allis Chalmers Company, Empire Limestone Company and the Casparis Stone Company concerned the use of the crushing roll technology developed at Edison's Ogden mine and later transferred to the Edison Portland Cement plant at Stewartsville, N.J. Testimony from that case by Emil Herter and Walter S. Mallory details research and development work by Edison and his assistants between 1889 and 1899. The complainant's brief on final hearing provides an excellent summary of Edison's case, including discussions of the state of the art and the later infringement that led to the suit. Courtesy of Thomas Edison National Historical Park.