37 Construction, repair, and installation services, namely, utilizing machines for construction services in the fields of building construction, mining, drilling, derricking, excavating, conveying, winching, cable conveying, crane work, aerial device work, lifting, and digging, and installations composed therefrom; repair or maintenance of construction machines and apparatus, namely, repairing of machines utilized for building construction, mining, drilling, derricking, excavating, conveying, winching, cable conveying, crane work, aerial device work, lifting, and digging; and installation services, namely, the installation of motors, mechanical systems, electrical systems, communications systems and wires, and buildings