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The city of Leningrad. View of the interior of an old manual telephone exchange. Telephone operators at their workplaces. Hands of telephonists flicker on the shields. The telephone operators hand over the headphones in the office of the station chief in connection with the switching of the manual telephone exchange to the Herzen automatic one and their transfer to work at the Main Telegraph. Internal view of an automatic telephone exchange. A girl and a man work in the control room.