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Production. Pratt and Whitney airplane engines. A propeller shaft of a Pratt and Whitney airplane engine is carefully…
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Production. Pratt and Whitney airplane engines. A propeller shaft of a Pratt and Whitney airplane engine is carefully checked for concentricity in a large Eastern plant steadily producing at a high rate for our armed forces. Pratt and Whitney Aircraft. Sourced from the Library of Congress.

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Production. Pratt and Whitney airplane engines. A propeller shaft of a Pratt and Whitney airplane engine is carefully checked for concentricity in a large Eastern plant steadily producing at a high rate for our armed forces. Pratt and Whitney Aircraft. Sourced from the Library of Congress.

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