Contractors and supervisors, maintenance trades and heavy equipment and transport operators

This minor group includes maintenance trade contractors and heavy equipment and transport operator contractors who own and operate their own businesses; and supervisors who supervise and co-ordinate the activities of workers in maintenance and heavy equipment and transport operator trades. They are employed by railway transport companies and urban transit systems; utilities; aircraft manufacturing, maintenance, repair and overhaul establishments; airlines and other aircraft operators; industrial machinery and transportation equipment and vehicle manufacturers; companies that own and operate heavy equipment and heavy equipment dealers, rental and service establishments; elevator construction and maintenance companies; refrigeration and air conditioning installation contractors, retail and servicing establishments and food wholesalers; engineering firms; motor vehicle dealers, garages, truck and trailer dealerships, fleet maintenance companies, and service stations; heating systems installation and service companies; appliance repair shops service companies and repair departments of retail and wholesale establishments; and electrical repair shops, service shops of electrical equipment manufacturers and maintenance departments of manufacturing companies; or they may be self-employed.