Snippets of History: #This_day_in_history On June 27, 1931, aviation pioneer Igor Sikorsky filed for a patent and became a creator of the first helicopter https://twitter.com/tassagency_en/status/879605842718470144 – @AceHistoryNews

#AceHistoryNews – June.27: On June 27, 1931, aviation pioneer Igor Sikorsky filed for a patent and became a creator of the first helicopter #AceHistoryNews reports

https://twitter.com/tassagency_en/status/879605842718470144
http://pic.twitter.com/HEHQfl8Jj9

— TASS (@tassagency_en) June 27, 2017 #AceHistoryNews

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