70 YEARS
EMJAY Engineering & Construction Co., Inc.
60 YEARS
J. Vinton Schafer, A Quandel Company
50 YEARS
J. M. Lippa Electrical Contractors, Inc.
40 YEARS
Mid-Atlantic Electrical Contracting, Inc.
30 YEARS
Casper G. Sippel, Inc.
Harford Refrigeration Co., Inc.
James A. Quick, Inc.
RCM&D
20 YEARS
Allegany Door and Hardware, Inc.
Avena Contracting, LLC
Baltimore County Public Schools Office of Career and Technology Education
DEL Electric
Johnson Controls, Inc.
Johnston Construction Company
Kogok Corporation
Maryland Mechanical Systems
Mechanical Engineering & Construction Corporation
Southway Builders, Inc.
Temps Now, Inc.