Inside Out Library · ExploreThe inventor's universal educator. An educational cyclopaedia and guide for inventors, patentees, manufacturers, mechanics, and all others connected directly or indirectly with patents (1919)Dieterich, Fred G., 1858-1923, comp · Washington, D.C. · leaf 59603,Patents · Mechanical movementsInternet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.More pictures from The inventor's universal educator. An educational cyclopaedia and guide for inventors, patentees, manufacturers, mechanics, and all others connected directly or indirectly with patentsMore like this
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