EASTERBROOK, Circuit Judge.
May a question "arise under" the patent laws, thus creating federal jurisdiction in the district court, but not "arise under" the patent laws for purposes of appellate jurisdiction? This is the question we must answer. No other court has faced it yet. Christianson v. Colt Industries Operating Corp., ___ U.S. ___, 108 S.Ct. 2166, 100 L.Ed.2d 811 (1988), holds that jurisdiction under the patent laws in the district court is a necessary...
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