Pp786-antique Grid Parchment Drafting Triangle 1922 Patent Poster
by Cole Borders
Title
Pp786-antique Grid Parchment Drafting Triangle 1922 Patent Poster
Artist
Cole Borders
Medium
Digital Art - Digital Art
Description
Displayed is a vintage patent illustration for a calculating instrument, dated October 24, 1922. The document features grid lines in the background with a protractor-like device at the center and includes a signature of the inventor, Leroy J. Leishman, along with the patent number 1,438,083.
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March 12th, 2020
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