Edith L. De Grave, GB189422420A
Edith L. De Grave, GB189422420A.
Image credit: De Grave, E.L. (1894)
On March 9, 1895, Edith L. De Grave, a resident of London, was awarded a patent for developing a novel copybook designed to prevent inadvertent errors by concealing the line above.
Date of Application: 20 November 1894
Date of Issuance: 9 March 1895
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Francesca Chiaradia
PhD Student in Economics
My research interests include law and economics, economics of innovation, and information economics.