Last modified on 15 December 2012, at 23:48

Category:Patent models

 The article Patent models on Wikipedia projects: (en) Patent model ·
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A patent models was a scratch-built miniature model no larger than 12" by 12" by 12" (approximately 30 cm by 30 cm by 30 cm) that showed how an invention works. It was one of the most interesting early features of the United States patent system