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May 24 Patent of the Day

Posted on May 24, 2016 by bwheelock

On May 24, 1932, U.S. Patent No. 1,859,624, issued to Leroy R. Grumman on Retractable Landing Gear.

24-May

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About bwheelock

Education J.D., Washington University in St. Louis B.S.E. in Mechanical Engineering, Duke University
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