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3S Incorporated
American Fire Protection Group, Inc.
APi Construction Company
APi Distribution, Inc.
APi National Service Group
Classic Industrial Services, Inc.
CMS Mechanical Services, Inc.
Davis-Ulmer Sprinkler Company
Grunau Company, Inc.
ICS, Inc.
International Fire Protection, Inc.
J. Fletcher Creamer & Son, Inc.
Jamar Company
Jomax Construction Company, Inc.
LeJeune Steel Company
Metropolitan Mechanical Contractors, Inc.
Mid-Ohio Pipeline Services
MP Nexlevel
Northland Constructors of Duluth, Inc.
NYCO, Inc.
Premier Fire & Security
Security Fire Protection Company, Inc.
SK FireSafety Group
Summit Pipeline Services ULC
Tessier's, Inc.
Texas Sprinkler
Train Oilfield Services Ltd.
Twin City Garage Door Company
United Piping Inc.
United States Alliance Fire Protection, Inc.
Viking Fire Protection Group
Vipond Inc.
Western States Fire Protection Co.