This case contains testimony and exhibits concerning work conducted at the West Orange Laboratory by Edison and his assistants. Much of the testimony relates to work undertaken for Edison by Jonas Walter Aylsworth, whose notebooks were entered as evidence. The entire printed record of the case has been selected except for five transcribed notebooks by Aylsworth and two by Clarence B. Fargo. These items appear in the Notebook Series. Immediately preceding the court record the Brief for Defendant, which summarizes the case, has been selected. Courtesy of Thomas Edison National Historical Park.