42 Engineering services; product research, design and development in the field of fans, extractor fans, dampers, blowers, compressors, circulators, gas circulators, manipulators, breakers, crushers, cooling, air conditioning, ventilating, heating and environmental control apparatus and installations, heat regenerators, air reheaters, incinerators, pre-heaters, heat exchangers, gearboxes and parts and fittings for all of the aforesaid; design and development of computer software for others; design and development of acoustic simulation software; mechanical and engineering research in the field of linear and non-linear stress analysis, acoustic analysis, structural dynamics, metal fatigue, metal fracture, metal creep site strain gauging and testing; technical research in the field of electronics; design and development of electronic equipment, namely, computer software, computers and computerized control units; product safety testing, namely, conducting vibration assessment, on site vibration assessment and performance testing of fans, extractor fans, dampers, blowers, compressors, circulators, gas circulators, manipulators, breakers, crushers, cooling, air conditioning, ventilating, heating and environmental control apparatus and installations, heat regenerators, air reheaters, incinerators, pre-heaters, heat exchangers, gearboxes and parts and fittings for all of the aforesaid; inspection of manufacturing and recycling plant operations for the purpose of efficiency analysis; materials testing, namely, vibration testing, acoustic testing, strain testing, operation and performance testing, metal fatigue analysis, metal fracture analysis and metal creep analysis of fans, extractor fans, dampers, blowers, compressors, circulators, gas circulators, manipulators, breakers, crushers, cooling, air conditioning, ventilating, heating and environmental control apparatus and installations, heat regenerators, air reheaters, incinerators, pre-heaters, heat exchangers, gearboxes and parts and fittings for all of the aforesaid; technical support services, namely, monitoring and machinery technical consultancy services in the field of industrial and commercial machinery; providing information, advisory and consultancy services in the field of industrial and commercial machinery and the maintenance thereof, product safety and product development