American Bell Desk Stand with Blake Transmitter
Gray Telephone Pay Station Co. founded
Gray Telephone Pay Station Co. founded
PDF:
American Bell Telephone Annual Report, 1891
PDF: American Bell Telephone Annual Report, 1891
Diagram: Bell long distance circuits map
Diagram: Bell long distance circuits map
Strowger forms Automatic Electric Company, receives switch patent
Strowger forms Automatic Electric Company, receives switch patent
