| 83322 | Automation of industrial processes, the, electrical engineering design services for | |
| 83310 | Automation of industrial processes, the, electrical installation appraisal of | |
| 83310 | Automation of industrial processes, the, engineering advisory and pre-design services for | |
| 83322 | Automation of industrial processes, the, geotechnical engineering services for | |
| 83322 | Automation of industrial processes, the, groundwater assessment for | |
| 83322 | Automation of industrial processes, the, integrated engineering services for | |
| 83322 | Automation of industrial processes, the, mechanical engineering design services for | |
| 83310 | Automation of industrial processes, the, mechanical installation appraisal of | |
| 83322 | Automation of industrial processes, the, other engineering services for | |
| 83330 | Automation of industrial processes, the, project management services concerning | |
| 83322 | Automation of industrial processes, the, specialty engineering design services for | |
| 83322 | Automation of industrial processes, the, structural engineering design services for | |
| 83322 | Automation of industrial processes, the, structural failure investigation of | |
| 83310 | Automation of industrial processes, the, structural installation appraisal of | |
| 83322 | Automation of industrial processes, the, technical inspection services during | |
| 83322 | Automation of industrial processes, the, undertaking contamination studies of | |
| 83310 | Automation of industrial processes, the, undertaking environmental impact studies of | |
| 83310 | Automation of industrial processes, the, undertaking project impact studies of | |
| 83310 | Automation of industrial processes, the, undertaking technical feasibility studies of | |
| Automobile (see also under Motor vehicle) | |
| 38540 | Automobile model kits | |
| 87141 | Automobile repair | |
| 87141 | Automobile tire repair | |
| 87141 | Automobiles, emergency road services for | |
| 83443 | Automobiles, mechanical testing and analysis of | |
| 49113 | Automobiles, passenger | |
| 83444 | Automobiles, technical inspection of | |
| 38540 | Automobiles, toy (excl. those for riding) | |
| 88745 | Automotive emissions testing equipment manufacturing services | |
| 88219 | Automotive trimmings manufacturing services | |
| 38510 | Autoskiffs, wheeled, children's, designed to be ridden | |
| 46121 | Auto-transformers, electric | |
| 13000 | Autunite | |
| 91260 | Auxiliary fire brigades, fire prevention services by | |
| 91260 | Auxiliary fire brigades, firefighting services by | |
| 67910 | Auxiliary freight transport services n.e.c. | |
| 91240 | Auxiliary military forces, administrative services related to | |
| 91260 | Auxiliary police forces, operation of | |
| 91260 | Auxiliary police, services of | |
| 45290 | Auxiliary printing devices for tabulating machines | |