HAYS, Circuit Judge:
This is an appeal from a judgment of the United States District Court for the Eastern District of New York, holding plaintiff's patent 2,942,172 valid and infringed by defendant's line of power supplies.
The plaintiff, a Massachusetts corporation with its principal place of business in West Concord, Massachusetts, is engaged in the manufacture and marketing of electronic apparatus.
The defendant, Kepco, Inc., is a New York corporation...
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