The inventor's universal educator. An educational cyclopaedia and guide for inventors, patentees, manufacturers, mechanics, and all others connected directly or indirectly with patents
A patent-practice cyclopaedia and mechanical-movements reference compiled by Fred G. Dieterich, published in Washington, D.C., in 1919 for inventors, patent agents, manufacturers and mechanics. Line engravings show numbered diagrams of gears, valves, pumps, cams and perpetual-motion schemes, many gridded several to a page in sectioned outline with hatched water and cutaway casings — usable as numbered diagram plates and small technical spot figures.
