CLAMP-ALL CORPORATION, PLAINTIFF, APPELLANT, v. CAST IRON SOIL PIPE INSTITUTE, ET AL., DEFENDANTS, APPELLEES. No. 87-1697.United States Court of Appeals, First Circuit.Heard January 4, 1988. Decided June 30, 1988. Page 479 [EDITORS’ NOTE: THIS PAGE CONTAINS HEADNOTES. HEADNOTES ARE NOT AN OFFICIAL PRODUCT OF THE COURT, THEREFORE THEY ARE NOT DISPLAYED.] Page 480 Richard S. […]