The Edison National Historical Park archives has seven bound volumes and one pamphlet of Patent Office proceedings relating to conflicting claims over who invented the telephone. This is the second of two volumes containing the records of interference cases 2 and 3 (involving Edison, Francis Blake, Jr., and Charles E. Chinnock) and cases 4, 5, 6, and B3 (involving Edison, Blake, and Edward L. Wilson). Each volume contains the preliminary statements, interfering specifications, and evidence of the disputant parties. The table of contents, preliminary statements, and interfering specifications have been selected, as well as the evidence for Edison.

Courtesy of Thomas Edison National Historical Park.