Lela M. Sherman, US2501745A
Gauge for Angular Measurements.
Image credit: Sherman, L.M. (1946)
On March 28, 1950, Lela M. Sherman of Dewey, Illinois, was granted a patent for a novel gauge. Designed to measure angles and bevels accurately, it featured a ruler, a pivoting protractor, and built-in levels for precise alignment.
Date of Application: 16 September 1946
Date of Issuance: 28 March 1950
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Francesca Chiaradia
PhD Student in Economics
My research interests include law and economics, economics of innovation, and information economics.