37 Installation, maintenance and repair of lifts, escalators, moving walkways and other vertical, horizontal and inclined conveyor installations as well as parts and fittings belonging to these installations; installation, maintenance, repair and constructional work being repair and maintenance for modernization of lifts, escalators, moving walkways and other vertical, horizontal and inclined conveyor installations as well as parts and fittings belonging thereto; partial disassembly of existing lifts, escalators, moving walkways and other vertical, horizontal and inclined conveyor installations in preparation of the modernization thereof for future repair; consultancy relating to installation, maintenance, repair and modernization being modification of lifts, escalators, moving walkways and other vertical, horizontal and inclined conveyor installations as well as parts and fittings belonging thereto; building contractor services, namely, mechanical and electrical contractor services for commercial and industrial buildings