4. The intervening defendant, The Perfect Circle Company (hereinafter referred to as "Perfect Circle"), is an Indiana corporation getting its principal place of small business at Hagerstown, Indiana. 8. Defendants Automotive and Perfect Circle are billed, in Civil Action No. 63, with infringement of claims 2 to 16, inclusive, by the manufacture and sale of Exhibit 14, a piston ring known as General GX Oil Stopper.