[Telephone operators.]
[People observing telephone operators.]
Communications, Telephone Exchange.
Telephone, New York Telephone Co. Exchanges.
[District selector frame in a dial exchange.]
National City Bank. Telephone exchange room.
[New York City Telephone Exchange.]
[Early types of switchboards.]
[Early types of switchboards, Old Spring Exchange.]
[Sender frames, dial equipment.]
[General view of some of the dial equipment, Trafalgar Central Office.]
Hospital. Interior, operating room