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March 11 Patent of the Day

Posted on March 11, 2016 by bwheelock

On March 11, 1851, U.S. Patent No. 7,972 issued to James W. Fowle on a Rock-Drilling Machine.

March 11

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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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