GARDNER, Circuit Judge.
This is a patent suit in which Robert L. Bobbitt, as plaintiff below, sought to enjoin the Midland Flour Milling Company, defendant, charging infringement of claims 3 and 4 of Letters Patent No. 1,354,878, dated May 5, 1920, for an improvement in dust collectors. The application for patent was filed November 27, 1914.
The patent relates to a type of dust collector in which dust-laden air is tangentially introduced into the upper cylindrical...
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