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