Designing of machines, chucks, drill chucks, other chucks, cutters, drills, drilling heads, drilling machines, electric hand drills, metalworking machines, holding devices for machine tools, cutting tools, metalworking machines and tools, other apparatus, instruments (including their parts), or systems composed of such machines, apparatus and instruments; designing; computer software design, computer programming or maintenance of computer software; technical advice relating to performance, operation, of computers, automobiles and other machines that require high levels of personal knowledge, skill or experience of the operators to meet the required accuracy in operating them; testing or research on machines, chucks, drill chucks, other chucks, cutters, drills, drilling heads, drilling machines, electric hand drills, metalworking machines, holding devices for machine tools, cutting tools, metalworking machines and tools, other apparatus and instruments; rental of computers; rental of computer software