BIGGS, Circuit Judge.
Barber Asphalt Corporation, formally joined as a plaintiff, successor to Barber Asphalt Company and the owner of Hayden United States Patent No. 1,684,671, and the real party in interest, the plaintiff Johnson-March Corporation, as exclusive licensee under the Hayden patent, brought suit against the defendant La Fera Grecco Contracting Company alleging direct infringement of claim 4 of the patent. Stulz-Sickles Company intervened in the suit...
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