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, apparatus, instruments; industrial design; computer software design, computer programming or maintenance of computer software; technical advice relating to performance and operation of computers, automobiles and other machines, namely, drilling machines, chucks, milling cutters, power drills, radial drills, machine tool holders, cutting machines, lathes 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 machines tools, cutting tools,metalworking machines and tools, apparatus and instruments; rental of computers; rental of computer software