The story of the American patent system; 1790, April 10, 1940
|Corporate Author:||United States.|
[Washington, U.S. Govt. print. off., 1940]
> United States.
Illustrations on p.  and  of cover
On verso of t.-p.: U.S. Department of commerce. Harry L. Hopkins, secretary. Patent office. Conway P. Coe, commissioner
viii, 28,  p.
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