450 F.3d 822 TAMKO ROOFING PRODUCTS, INC., Plaintiff-Appellant,v.SMITH ENGINEERING COMPANY; Smith Environmental Corporation; Kenneth C. Dargatz; Defendants,Haden Schweitzer Corporation, Defendant-Appellee. No. 04-3913. United States Court of Appeals, Eighth Circuit. Submitted: March 15, 2006. Filed: June 16, 2006. COPYRIGHT MATERIAL OMITTED COPYRIGHT MATERIAL OMITTED Peter E. Strand, argued, Washington, DC (Manual Lopez, Houston, TX, and Carlos […]