In 1940 this Bell System film played at 1000s of movie theaters. It was designed to educate millions about new technologies: Direct dial Dial tone Ring back tone Busy signal Prior, everything was operator assisted. The first time there was a mass scale technology education. https://twitter.com/BrianRoemmele/status/1195117852270841856 …pic.twitter.com/Pet6TOpGoI
Peter, of course. It was limited to a very few. It was not widely deployed. By the epoch if this film there was a federal mandate to update the entire network. This prompted the film.
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local exchanges were widely deployed. the ability to dial between exchanges, instead of by an operator, was mostly enabled by the crossbar switch, starting about 1938, and fully functioning by 1950. That entailed an expanded numbering plan. https://ethw.org/Electromechanical_Telephone-Switching …
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Peter, I hear ya. I wonder why the Bell System felt the need to spend millions of dollars in the early 40s to buy the slots before movies in cinemas to show this educational film if so many folks already had this technology.
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