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Production. Airplane propellers. A three-bladed hydromatic propeller assembly for an American warplane is tested for oil…
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Production. Airplane propellers. A three-bladed hydromatic propeller assembly for an American warplane is tested for oil leakage at a Hartford, Connecticut, plant. With this propeller, adjustments of blade pitch are made while the plane is in action. Sourced from the Library of Congress.

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Production. Airplane propellers. A three-bladed hydromatic propeller assembly for an American warplane is tested for oil leakage at a Hartford, Connecticut, plant. With this propeller, adjustments of blade pitch are made while the plane is in action. Sourced from the Library of Congress.

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