42 Engineering services in connection with machines, machine tools, treatment machines for plastic materials, treatment machines for packaging materials, machines for manufacturing hollow units of plastic materials, machines for manufacturing bottles and other containers, conveyors, bundle presses, filling machines, labeling machines, preform feeding machines, preform orienting machines, carton packers; technical studies, engineering services in the fields of manufacturing of packaging, containers, plastic materials, working of plastic materials, manufacturing of preforms, manufacturing of containers, design of bottles and containers, treatment of packaging materials and containers made of plastic, particularly for improving their gas barrier and impermeability property, labeling of containers, conveying, assembly, bundling and cartoning thereof; technical studies, engineering services with regard to development, running-in, repair services, improvement of machines, machine tools, treatment machines for plastic materials, treatment machines for packaging materials, machines for manufacturing hollow units of plastic materials, machines for manufacturing bottles and other containers, conveyors, bundle presses, filling machines, labeling machines, preform feeding machines, preform orienting machines, carton packers