DEVITT, Senior District Judge.
In this bench tried patents infringement suit between Minnesota corporations, each of which is engaged in the manufacture and sale of electromedical devices, plaintiffs Medtronic, Inc., and Med-Rel, Inc., claim that defendant Cardiac Pacemakers, Inc., has infringed three of their patents involving circuitry in implantable heart pacers and seek injunctive relief and damages. Defendant denies infringement and claims the patents are invalid...
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