Anyone ending a sketch and description may quickly ascertain our opinion free whether an invention is probably patentable. Communication sent free test agency for securing patents. Patents taken through MUNN Co. receive Notice, without charge, In the Scientific American illustrated weekly. Largest circulation of any scientific journal. Terms, a year four months. Sold by all newsdealers MU.and CO New York Branch Office, F St., Washington, D. C.
This article was originally published with the title "Patents" in SA Supplements 56, 1441supp, 127 (August 1903)