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  • ...Edison returned to a carbon filament.<ref>{{Cite book |title=The story of great inventions |author=Burns, Elmer Ellsworth |url=https://books.google.com/boo ...puts in a system of any size. He has got a new thing and it will require a great deal of experimenting to get it working practically.''"<ref>Maury Klein, Th
    105 KB (15,290 words) - 17:19, 16 December 2018