MOORMAN, Circuit Judge.
The Surface Combustion Company brought this suit against the Newton Steel Company, the owner and operator of steel treating furnaces, and the Duraloy Company, the builder of the Newton Company's furnaces, for infringement of the Marsh & Cochran patent, 1,610,567, for a method of annealing sheet steel. Defendants denied validity and infringement of the patent, and the Duraloy Company by counterclaim charged the plaintiff with infringing...
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