DONAHUE, Circuit Judge.
The Lakewood Engineering Company filed a bill of complaint in the District Court, alleging that it was the owner, by purchase on the 21st day of July, 1922, of United States letters patent 893,168, issued July 14, 1908, to Isaac Hewitt; that defendants, doing business under the firm name and style of Stein, Geisel & Stein, were infringing claims 1 and 3 of this patent, by the use of a machine known as the Ord concrete road surfacer, and...
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