ALLEN, Circuit Judge.
The parties will be denominated here as they were in the District Court.
These appeals challenge a decree of the District Court which found invalid Powers patent 2,039,607, Wilson patent 2,094,764, and Powers patent 2,107,800, all relating to improvements in oil-burning furnaces. Plaintiff's predecessor, Timken-Silent Automatic Company, was assignee of the three patents, and assigned them to plaintiff. The District Court found that if...
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