HOLMES, Circuit Judge.
Appellants filed this suit in the District Court seeking an injunction and an accounting against appellee for alleged infringement of patent No. 1,822,710, issued to Harry Pennington on a rotary drilling rig for oil and other deep well drilling. The other appellant, American Well & Prospecting Company, is the sole licensee. The bill was dismissed after a trial on the merits.
The bill alleged the issuance of the patent to Pennington...
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