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Negative, Bell Telephone transmitter
Negative, Western Electric Company, telephone
TDD Telecommunications System
Pullman Palace Car Company Photographs
Robert "Mack" McCormick Collection
Western Union Telegraph Company Records
Bell Telephone Company vs. Peoples Telephone Company, Vol 3, Complaint's and Proofs
The Mechanical Call Distribution System For Receiving Telegrams By Telephone From Patrons of the Western Union Tel. Co.
The Mechanical Call Distribution System
The Mechanical Call Distribution System
[Five Television Commercials]
[Four Television Commercials - Western Union services]
Speaking Telephone Interferences. Evidence for Thomas Edison. Interfering Applications and Exhibits, Vol. 1.
Members de la Conference Internationale Radiotelegraphique (American Telephone and telegraph Company, New York telephone Company, and Bell Telephone Laboratories)
U.S. vs. American Bell Telephone and Emile Berliner
Western Union vs. American Bell Telephone
Western Union vs. American Bell Telephone