[Telephone operators.]

[Telephone operators.]

[People observing telephone operators.]

Telephone, New York Telephone Co. Exchanges.

Telephone, New York Telephone Co. Exchanges.

Communications, Telephone Exchange.

Communications, Telephone Exchange.

Communications, Telephone Exchange.

Communications, Telephone Exchange.

[District selector frame in a dial exchange.]

Communications, Telephone Exchange.

Telephone, New York Telephone Co. Exchanges.

Communications, Telephone Exchange.

[New York City Telephone Exchange.]

National City Bank. Telephone exchange room.

[Early types of switchboards, Old Spring Exchange.]

[Early types of switchboards.]

[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.]