LOURIE, Circuit Judge.
Mark I Marketing Corporation and Mark I Marketing Corporation of America (collectively "Mark I") appeal from the order of the United States District Court for the Northern District of Illinois granting summary judgment of noninfringement in favor of R.R. Donnelley & Sons Company ("Donnelley"). Mark I Mktg. Corp. v. R.R. Donnelley & Sons Co., No. 92 C 8380, 1994 WL 603884 (N.D.Ill. Nov. 1, 1994). Because prosecution history estoppel...
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