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Thomas Edison letter to E.P. Fabbri, dated Menlo Park, N.J., 5 March 1880
...(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/thomasedisonlet00edis
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Thomas Edison letter to R.D. Worrell Jewelry Co., dated Orange, N.J., 27 September 1910
...(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/thomasedisonlet00edisa
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Collection of United States patents granted to Thomas A. Edison, 1869-1884 v. 1
...(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/collectionunitev1edis
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Collection of United States patents granted to Thomas A. Edison, 1869-1884 v.2
...(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/collectionunitevol2edis