> ASSOCIATED ENVIRONMENTAL INDUSTRIES, CORP. Oklahoma Since: 1992 ASSOCIATED ENVIRONMENTAL INDUSTRIES, CORP.
> DIVERSIFIED CONSTRUCTION OF OKLAHOMA, INC. Oklahoma Since: 1989 DIVERSIFIED CONSTRUCTION OF OKLAHOMA, INC.
> HUBERT E. BUTLER CONSTRUCTION COMPANY, L.L.C. Connecticut Since: 2000 HUBERT E. BUTLER CONSTRUCTION COMPANY, L.L.C.