37 installation, maintenance, and repair of systems for providing heating, ventilating, air conditioning, lighting, security, and fire alarm for industrial, commercial, and governmental facilities
40 custom manufacture of systems for providing heating, ventilating, air conditioning, lighting, security, and fire alarm for industrial, commercial, and governmental facilities
42 design services for others in the field of systems for providing heating, ventilating, air conditioning, lighting, security and fire alarm for industrial, commercial, and governmental facilities