LOURIE, Circuit Judge.
This is an appeal from the December 6, 1990, order of the United States District Court for the Western District of Pennsylvania which preliminarily enjoined The Conair Group, Inc. from infringing U.S. Patents 4,180,539, 4,632,752, and 4,025,252. Conair Group, Inc. v. Automatik Apparate-Maschinenbau, 19 USPQ2d 1535 (W.D.Pa.1990). We vacate and remand.
BACKGROUND
Automatik Apparate-Maschinenbau GmbH is the assignee of...
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