MARIS, Circuit Judge.
The defendant has appealed from a decree entered against it by the District Court for the District of Delaware in a patent infringement suit. The patents involved are Nos. 1,574,546, 1,574,547 and 1,623,773, all issued to John E. Bell and now held by the plaintiff as assignee. A number of questions are raised upon the appeal, but the only one we need consider is that of the validity of the patents.
Patent No. 1,574,546 was issued to Bell...
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