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Index of patents relating to electricity
...(CC0 1.0) This content is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this...
https://library.si.edu/digital-library/book/indexofpatentsre05unit
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The autobiography of Joseph Jefferson
...(CC0 1.0) This content is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this...
https://library.si.edu/digital-library/book/autobiographyof00jeff
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Interference, B. M. Johnson vs. Odell and Jones
...(CC0 1.0) This content is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this...
https://library.si.edu/digital-library/book/interferencebmjo00unit