[Early types of switchboards, Old Spring Exchange.]
[People observing telephone operators.]
[Man at switchboard.]
[Close up of a teletypewriter switchboard.]
[Overseas switchboard at 32 Avenue of the Americas.]
[Sender frames, dial equipment.]
[General view of some of the dial equipment, Trafalgar Central Office.]
[Switchboard at the long distance headquarters of the American Telephone and Telegraph Company.]
[District selector frame in a dial exchange.]
[Radio transmitting station--Western Electric Company.]
Styles of Long Distance Instruments
Communications, Telephone Exchange.
Telephone, New York Telephone Co. Exchanges.