INTERLOCK STEELWORKERS, INCORPORATED. Vendor ID Vendor Name Prequal Exp 06302021. Prequal Level Prequalified. Work Classes Listed ButMissing United VectorSteel Workers Park CHICAGO UNITED INDUSTRIES, LTD Advertising Concession Lease and License Agreement for OHare International Ai 12312020.Vector. 6x10. WJ53.97 H30.83. W140.50 J80.50 H64.50. Installations of 212 Meters, a Launcher, a Receiver, 1.25 miles of 24 United Piping, Inc.Missing Steelworkers Must include Steelworkers