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  • Patent US-1880-PAMPHLET
    |Inventors=Thomas Alvin EDISON ....espacenet.com/publicationDetails/biblio?FT=D&CC=US&NR=PAMPHLET espacenet] Edison apparently began (unsuccessful) helicopter experiments in 1880; pamphlet no
    586 bytes (75 words) - 17:07, 11 September 2017
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