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Mesa Energy Systems, Inc.  (44) Aircond Corporation  (26) Kinder Morgan  (14) SmartTech Contracting LLC  (14) Hugh Chatham Memorial Hospital  (11) EMCOR Facilities Services, Inc.  (10) CoolSys  (8) Rabalais Constructors, LLC  (7) DeBra-Kuempel Inc.  (5) Scalise Industries Corporation  (4) EMCOR Services New York/New Jersey, Inc.  (4) Hill York Services Corporation, LLC  (2) Control Solutions Group, Inc.  (2) The Betlem Service Corporation  (2) Yale New Haven Health  (1) Dallas Mechanical Group LLC  (1) Mechanical Services of Central Florida, Inc.  (1) Diversified Gas & Oil Corporation  (1)