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- The first Hamilton Standard constant speed governor application from the 1930's. The Woodward Governor Company manufactured all their governors.
- The Douglass DC3 Aircraft with the first application of Elmer Woodward's propeller engine governor from patent number 2,204,640.
- Google "Douglass DC-3 aircraft" for history on this legacy aircraft.
- An Aero Digest Aviation Engineering History Project.
- MAY 1934.