NIELDS, District Judge.
This is a patent infringement suit of Sinclair Refining Company, plaintiff, against Globe Oil & Refining Company, defendant. The bill of complaint charges defendant with infringement of three letters patent:
(1) Patent No. 1,574,546, for an "Oil Heating Furnace," applied for January 28, 1922, and issued February 23, 1926, to John E. Bell, assignor to plaintiff, with claims Nos. 1, 2, 3, 9, and 13 in suit.
(2) Patent No....
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