A round piece of metal with two screws, one large central hole and twelve smaller holes. A small curved metal arm protrudes from the piece. The piece of metal is connected to another round piece of metal with a squared piece protruding from the lower round piece of metal. Created by Benjamin G. Sullivan Date Created 06/23/2020 Source Smithsonian National Air and Spa Keywords Aviation; People; Propulsion Rights and Restrictions Not determined
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