KERNER, Circuit Judge.
Plaintiff sued defendants claiming that by the construction of railway dump cars manufactured and sold by defendants, they, defendants, infringed three claims of Patent No. 1611012; seventeen claims of Patent No. 1972042; nine claims of Patent No. 1972043; five claims of Patent No. 1785678; and four claims of Patent No. 1813570. The defenses were invalidity, non-infringement, and that plaintiff did not come into court with clean hands in that...
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