RADER, Circuit Judge.
On summary judgment, the United States District Court for the Eastern District of Tennessee ruled that Cardinal IG Co. (Cardinal) did not infringe U.S. Patent No. 4,859,532. AFG Indus., Inc. v. Cardinal IG Co., No. 2:96-CV-244 (E.D.Tenn. Oct. 1, 2002). Because the district court erred in granting summary judgment of noninfringement, this court vacates and remands.
I.
This litigation began in 1996, when AFG Industries...
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