499 U.S. 365 499 U.S. 365 111 S.Ct. 1344 113 L.Ed.2d 382 CITY OF COLUMBIA and Columbia Outdoor Advertising, Inc., Petitioners,v.OMNI OUTDOOR ADVERTISING, INC. No. 89-1671. Argued Nov. 28, 1990. Decided April 1, 1991. Syllabus After respondent Omni Outdoor Advertising, Inc., entered the billboard market in petitioner Columbia, South Carolina, petitioner Columbia Outdoor Advertising, Inc. […]