Chelsea Telephone Exchange, testing box.

View of test for window in Chelsea exchange.

View of test for window in Chelsea exchange.

View of test for window in Chelsea exchange.

View of test for window in Chelsea exchange.

National City Bank. Telephone exchange room.

Bay Boulevard. Far Rockaway Telephone Exchange addition.

Bay Boulevard. Far Rockaway Telephone Exchange addition.

Communications, Telephone Exchange.

West 100th Street. New York Telephone Exchange Building.

North River Savings Bank (now Chelsea Exchange National Bank), interior.

Communications, Telephone Exchange.

Communications, Telephone Exchange.

Communications, Telephone Exchange.

Telephone, New York Telephone Co. Exchanges.

Telephone, New York Telephone Co. Exchanges.

Telephone, New York Telephone Co. Exchanges.

Communications, Telephone Exchange.

Communications, Telephone Exchange.

[Telephone table.]