Ava M. Beard, US2279652A
Power Take-Off for Ground Pulverizers.
Image credit: Beard, A.M. (1940)
On April 14, 1942, Ava M. Beard of Butler, Missouri, patented a power take-off drive for cylindrical ground pulverizers. Her design provided a positive, tractor-driven mechanism with adjustable height control, giving simpler construction, sturdier operation, and precise regulation of soil-cutting depth.
Date of Application: 25 November 1940
Date of Issuance: 14 April 1942
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Francesca Chiaradia
PhD Candidate in Economics
My research interests include innovation, law, and information economics.