History: A technician doing maintenance work on the electromechanical telephone switches in the telephone exchange building at East 30th St., New York, New York, 1938 [975x799]

https://i.redd.it/pli5ce732rv11.jpg via /r/HistoryPorn https://www.reddit.com/r/HistoryPorn/comments/9tb7me/a_technician_doing_maintenance_work_on_the/?utm_source=ifttt