286 F.3d 598 Robert E. HARTLINE, et al., Appellants,v.SHEET METAL WORKERS’ NATIONAL PENSION FUND, et al., Appellees. No. 01-7078. United States Court of Appeals, District of Columbia Circuit. Argued March 5, 2002. Decided April 23, 2002. Appeal from the United States District Court for the District of Columbia (98cv01274). David S. Preminger argued the cause […]