[Sender frames, dial equipment.]
[Telephone operators.]
[General view of some of the dial equipment, Trafalgar Central Office.]
[People observing telephone operators.]
Communications, Telephone Exchange.
Telephone, New York Telephone Co. Exchanges.
[Early types of switchboards, Old Spring Exchange.]
[General view of sender frames in a panel dial central office.]
[New York City Telephone Exchange.]
[Woman at a telegraph machine.]
[Close up of a teletypewriter switchboard.]
