09/20/1881 Boehm, Ludwig K -- Legal Statements and Testimony
(Scientific American; American Association for Advancement of Science [supplied or conjectured]; Goepel, Paul; Geissler, Heinrich; Batchelor, Charles; Upton, Francis Robbins; Dyer, George W; Sprengel, Hermann Johann Philipp; Raegener, Louis; Edison, Thomas Alva; Baetz, William; Crookes, William) Telephone; Vacuum and glass bulb
[W100DEF]  National Archives, Washington, D.C.: Records of the Patent and Trademark Office (Record Group 241) -- Patent Interference Files -- Boehm v. Edison -- Rebutting Testimony on Behalf of Boehm
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Courtesy of the National Archives.