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Ptak Science Books: Mall-Mortuary Faces on Robot Patent Drawings, 1936-1976
Monopoly - original patent drawing
A LEGO patent drawing from 1958, discovered by Mrs. Easton.
explore-blog: Beautiful patent drawing for R. J. Spalding’s Flying Machine, 1889. Complement with the illustrated history of human flight and 100 diagrams that changed the world.
Live drawing at Pick Me Up by Owen Gatley's Illustration