POSNER, Circuit Judge.
The plaintiffs brought suit for patent infringement against the defendant, and prevailed in the district court, precipitating an appeal that, among other things, challenges the patent's validity. Dissatisfied with the amount of relief the court gave them, the plaintiffs cross-appeal; but on the view we take, the only issue we shall have to consider is whether the patented invention would have been "obvious" to persons skilled in the relevant...
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