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Production. Pratt and Whitney airplane engines. Magneto driving gears for Pratt and Whitney airplane motors are tested for…
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Production. Pratt and Whitney airplane engines. Magneto driving gears for Pratt and Whitney airplane motors are tested for hardness on a Rockwell machine in a large Eastern plant producing engines in great numbers for our armed forces. Pratt and Whitney Aircraft. Sourced from the Library of Congress.

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Production. Pratt and Whitney airplane engines. Magneto driving gears for Pratt and Whitney airplane motors are tested for hardness on a Rockwell machine in a large Eastern plant producing engines in great numbers for our armed forces. Pratt and Whitney Aircraft. Sourced from the Library of Congress.

More