[Telephone operators.]

[Telephone operators.]

[People observing telephone operators.]

Communications, Telephone Exchange.

Telephone, New York Telephone Co. Exchanges.

Telephone, New York Telephone Co. Exchanges.

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.

National City Bank. Telephone exchange room.

[Early types of switchboards.]

[New York City Telephone Exchange.]

[Telephone table.]

Hospital. Interior, operating room

[Early types of switchboards, Old Spring Exchange.]

[Stockboard.]