The inventor's universal educator.
Subtitle: An educational cyclopaedia and guide for inventors, patentees, manufacturers, mechanics, and all others connected directly or indirectly with patents.
By: Comp. and pub. by Fred G. Dieterich ...
Published: 1919
Place of publication: Washington, D.C
Language: eng
Number of pages: 159
Subjects: Patents; Mechanical movements
Other titles: 50 perpetual motions.