SIMONS, Circuit Judge.
The patent involved in the present infringement suit is Hughes No. 1,930,897, issued October 17, 1933, upon an application filed April 13, 1928, for a tuyère. The District Court held it valid and infringed, enjoined future infringement and ordered an accounting. Appeal followed.
Tuyères are employed in underfeed stokers for feeding coal and directing air into the fuel bed of the furnace to aid combustion, and are made up of...
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