GAJARSA, Circuit Judge.
The parties in this case own interfering patents that teach a slotted header that prevents dry wall from cracking during earthquakes by permitting the wallboard to move up and down. Plaintiff-Appellant Slip Track Systems, Inc. ("Slip Track") owns U.S. Patent No. 5,127,760 ("the '760 patent") and Defendant-Cross-Appellant Metal-Lite Inc. ("Metal-Lite") owns
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