This pamphlet contains a 13-page brief filed on behalf of Edison by D. H. Driscoll of the law firm of Dyer & Seely, probably in 1883. It is entitled "Some Errors in the Brief filed on behalf of Swan" and quotes from that brief and from testimony on behalf of Edison. The case concerns a patent interference relating to electric lighting.

Related interference records can be found in Records of the Patent and Trademark Office (Record Group 241) in the National Archives.

Courtesy of Thomas Edison National Historical Park.