Advisory services relating to the construction of mechanical engineering structures; Mechanical and chemical cleaning services; Mechanical engineering services (construction); Advisory services relating to the repair of mechanical engineering structures; Repair of parts of engines; Repair of machines; Repair of electronic apparatus; Repair of electronic business equipment; Repair of electrical appliances; Maintenance, installation and repair of industrial apparatus and instruments; Maintenance and repair of industrial apparatus; Maintenance and repair of construction apparatus; Maintenance and repair of construction machines; Advisory services for maintenance; Diagnostic maintenance services