This is one of a number of suits between the American Graphophone Co. and the National Phonograph Co. concerning recording cylinder technology. This case contains testimony relating to the work conducted at the West Orange Laboratory by Edison and his assistants. The following items have been selected:

• Brief for Complainant
• Brief for Defendant
• Appendix II: "Thomas A. Edison, as a Patentee and Litigant"
• Transcript of Record
• Bill of Complaint
• Complainant's Evidence
• Complainant's Exhibits
• Answer
• Defendant's Evidence
• Testimony of Walter H. Miller
• Testimony of Jonas Walter Aylsworth