| 53129 | Indoor sports facilities | |
| 54129 | Indoor sports facilities, general construction of | |
| 54129 | Indoor swimming pools, general construction of structures for | |
| 53129 | Indoor swimming pools, structures for | |
| 53129 | Indoor tennis courts | |
| 54129 | Indoor tennis courts, general construction of | |
| 48244 | Inductance bridges | |
| 48243 | Induction instruments for measuring electrical quantities (excl. electricity supply meters) | |
| 46122 | Inductors, electric (excl. induction coils and transformers) | |
| 34310 | Indulines | |
| 37340 | Industrial articles, of refractory ceramics | |
| 53121 | Industrial buildings | |
| 83321 | Industrial buildings, corrosion control programmes for | |
| 83321 | Industrial buildings, electrical engineering design services for the construction of | |
| 83310 | Industrial buildings, electrical installation appraisal of | |
| 83310 | Industrial buildings, engineering advisory and pre-design services for the construction of | |
| 83321 | Industrial buildings, engineering services n.e.c. for the construction of | |
| 85330 | Industrial buildings, general cleaning of | |
| 54121 | Industrial buildings, general construction of | |
| 85330 | Industrial buildings, general maintenance of | |
| 83321 | Industrial buildings, geotechnical engineering services for the construction of | |
| 83321 | Industrial buildings, groundwater assessment for the construction of | |
| 83321 | Industrial buildings, integrated engineering services for the construction of | |
| 83321 | Industrial buildings, mechanical engineering design services for the construction of | |
| 83310 | Industrial buildings, mechanical installation appraisal of | |
| 83330 | Industrial buildings, project management services concerning the construction of | |
| 72112 | Industrial buildings, rental or leasing of | |
| 83321 | Industrial buildings, specialty engineering design services for the construction of | |
| 83321 | Industrial buildings, structural engineering design services for the construction of | |
| 83321 | Industrial buildings, structural failure investigation of | |
| 83321 | Industrial buildings, technical inspection services during the construction of | |
| 83321 | Industrial buildings, undertaking contamination studies of | |
| 83310 | Industrial buildings, undertaking environmental impact studies of | |
| 83310 | Industrial buildings, undertaking project impact studies of | |
| 83310 | Industrial buildings, undertaking technical feasibility studies of | |
| 61171 | Industrial chemicals, basic, wholesale trade services of, except on a fee or contract basis | |
| 61271 | Industrial chemicals, basic, wholesale trade services of, on a fee or contract basis | |
| 73330 | Industrial designs, patents, licensing services for the right to use | |
| 83129 | Industrial development, consulting services concerning | |
| 94239 | Industrial establishments, collection and transportation of non-recyclable, non-hazardous waste from | |