Howard Robard Hughes Sr. (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "Howard Robard Hughes Sr." in German language version.

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  • Patent US930758A: Drill. Angemeldet am 20. November 1908, veröffentlicht am 10. August 1909, Erfinder: Howard R. Hughes.
  • Patentübersicht Howard Hughes R, abgerufen am 11. Juni 2012

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