Manufacture of super-hyromatic airscrews

File includes reports and memorandums on a proposal for de Havillands to produce a super hydromatic propeller, together with a report and other material relating to Cleaver's visit to the United States, including vists to the United Aircraft Corporation (UAC), UAC's Hamilton Standard Propellers division, the National Advisory Committee for Aeronautics, Wright Field, Aeroproducts, Allis Chalmers and the Woodward Governor Company.