Strowger switch - Wikipedia - discu.eu

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Strowger Telephone Switch (1891) https://en.wikipedia.org/wiki/Strowger_switch 12 comments 24/11/2016

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How electric lighting changed our sleep, and other stories in materials science | Ars Technica https://arstechnica.com/science/2021/01/how-electric-lighting-changed-our-sleep-and-other-stories-in-materials-science/ 0 comments

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