[District selector frame in a dial exchange.]
[Sender frames, dial equipment.]
[Telephone operators.]
[General view of some of the dial equipment, Trafalgar Central Office.]
[Switchboard at the long distance headquarters of the American Telephone and Telegraph Company.]
[Page in Sharp's black book.]
[People observing telephone operators.]
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The Metropolitan Telephone and Telegraph Co. List of Subscribers, September 1, 1894
[Civil defense message room.]
