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• Identified! [Paragon adjustable and reversible aircraft propeller created by Spencer Heath and tested on October 11, 1922, Bolling Field, Washington, D.C.] (LOC)

  • Uploaded by: The Library of Congress
  • License: No known copyright restrictions
  • 8 comments
  • 24 favorites
  • 21,860 views
  • Date taken: 1922
  • Date uploaded: 2015-10-02
  • Tags: libraryofcongress, dc:identifier=httphdllocgovlocpnphec42506, xmlns:dc=httppurlorgdcelements11, aviation, aircraftpropeller, airplanepropeller, propeller, adjustablepitchpropeller, paragonadjustableandreversibleaircraftpropeller, variablepitchpropeller, spencerheath, heath, mysterysolved, bollingfield, bollingafb, hispanosuiza, hispanosuiza8
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