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These interferences involve patent applications filed by Edison, Edward L. Aiken, Wilburn N. Dennison, Thomas H. Macdonald, Alexander N. Pierman, Peter Weber, and others. Documents have been selected from the records of five interferences involving the duplication and amplification of records, a recording cutter, and a sound box. The selected material consists of patent office filings, correspondence, briefs, and testimony that discuss Edison's role in the invention process or the interference proceedings. Two closely related proceedings have been grouped in the same folder.
The interference records not selected involve concealed horns, reproducers, return devices, speed regulators, and a variety of other improvements.