Petro Chemical Bio-DiagnosticsLogo Design Contest Logo Design Contest Contests / Petro Chemical Bio-Diagnostics Petro Chemical Bio-Diagnostics has selected their winning logo design. For $375 they received 84 designs from 20 different designers from around the world. Find out how LogoTournament works How LogoTournament works Contest Entries by insignificart Return to Contest Return to Contest Withdrawn New #16 Discussion No comments yet.