42 Engineering services for the design, construction, and operation of mechanical systems for buildings; engineering services for the design, construction, and operation of mechanical systems for infrastructure; engineering services for the design, construction, and operation of mechanical systems for buildings and facilities used for industrial, logistical, governmental, commercial, civic, educational, scientific, medical, health, and community use purposes; engineering services for the design, construction, and operation of electrical systems for infrastructure; engineering services for the design, construction, and operation of electrical systems for buildings and facilities used for industrial, logistical, governmental, commercial, civic, educational, scientific, medical, health, and community use purposes; engineering services for the design, construction, and operation of plumbing systems for buildings; engineering services for the design, construction, and operation of plumbing systems for infrastructure; engineering services for the design, construction, and operation of plumbing systems for buildings and facilities used for industrial, logistical, governmental, commercial, civic, educational, scientific, medical, health, and community use purposes; engineering services for the design, construction, and operation of IT systems for buildings; engineering services for the design, construction, and operation of IT systems for infrastructure; engineering services for the design, construction, and operation of IT systems for buildings and facilities used for industrial, logistical, governmental, commercial, civic, educational, scientific, medical, health, and community use purposes; engineering services for the design, construction, and operation of medical equipment systems for buildings; engineering services for the design, construction, and operation of communications systems for buildings; engineering services for the design, construction, and operation of communications systems for infrastructure; engineering services for the design, construction, and operation of communications systems for buildings and facilities used for industrial, logistical, governmental, commercial, civic, educational, scientific, medical, health, and community use purposes; technical consultation in the field of environmental science, engineering services, design for others in the field of energy engineering, designing and testing of energy products for others; Technological planning and consulting services for others for technical purposes in the fields of commercial and environmentally sustainable architectural design, engineering, and construction services; research in the field of building construction, namely, the design, construction, and operation of buildings; quality assurance services for the design, construction, and operation of buildings; Technological planning and consulting services for others for technical purposes in the fields of sustainable architectural and building product development; Technological planning and consulting services in the field of sustainability and decarbonization for buildings and infrastructure used for industrial, logistical, governmental, commercial, civic, educational, scientific, medical, health, and community use purposes