TRADE MARKS DESIGNS COPYRIGHTS & C Anyone sending a sketch and description may quickly ascertain oar opinion free whether an invention is probably patentable. Communications strictly confidential. Handbook on Patents sent tree. Oldest agency for securing patents. Patents taken through Munn &Co. receive special notice, without cbarsre. in the Scientific American. A handsomely illustrated weekly. Largest circulation of any scientific -journal. Terms. $3 a year; four months, $1. Sold by all newsdealers. MUNN Co.3--"B"New York Branch Office. 685 P St.. Washington, D. C.
This article was originally published with the title "Patents" in SA Supplements 51, 1313supp, 143 (March 1901)