438 U.S. 234 98 S.Ct. 2716 57 L.Ed.2d 727 ALLIED STRUCTURAL STEEL COMPANY, Appellant,v.Warren SPANNAUS et al. No. 77-747. Argued April 25, 1978. Decided June 28, 1978. Rehearing Denied Oct. 2, 1978. See 439 U.S. 886, 99 S.Ct. 233. Syllabus Appellant, an Illinois corporation, maintained an office in Minnesota with 30 employees. Under appellant’s pension […]