|
| 7491 | Office personnel services (personnel suppliers) | |
| 5139 | Office supplies (except furniture, machines), wholesale | |
| 5239 | Office supplies stores selling primarily to other businesses but also selling to household consumers | |
| 2109 | Office supplies, die-cut, made from purchased paper or paperboard | |
| 7491 | Office supply pools | |
| 8519 | Offices of shiatsu therapists | |
| 7514 | Official languages office, provincial government | |
| 3410 | Off-road all-terrain vehicles (ATV's), wheeled or tracked, manufacturing | |
| 2422 | Offset inks, manufacturing | |
| 2222 | Offset plate preparation services | |
| 2221 | Offset printing (except books, manifold business forms, printing grey goods, quick printing) | |
| 2221 | Offset printing (except manifold business forms, quick printing, textile fabrics), without publishing | |
| 2929 | Offset printing presses, manufacturing | |
| 1120 | Offshore drilling, oil and gas, on contract basis | |
| 0500 | Offshore fishing, freshwater | |
| 0500 | Offshore fishing, salt water | |
| 7129 | Offshore tool rental | |
| 9249 | Off-track betting parlours | |
| 3312 | Ohmmeters, manufacturing | |
| 1110 | Oil (crude) production, non-conventional | |
| 2320 | Oil (i.e., petroleum) refineries | |
| 2429 | Oil additive preparations, manufacturing | |
| 2320 | Oil additives, made in petroleum refineries | |
| 5149 | Oil additives, wholesale | |
| 1110 | Oil and gas exploration (except on contract or fee basis) | |
| 7421 | Oil and gas exploration services, seismographic | |
| 2924 | Oil and gas field drilling machinery and equipment (except offshore floating platforms), manufacturing | |
| 7421 | Oil and gas field seismographic surveys | |
| 5143 | Oil and gas heating equipment, wholesale | |
| 2924 | Oil and gas plant equipment repair | |
| 7010 | Oil and gas rights, leasing (if lessors) | |
| 1120 | Oil and gas well drilling, on contract basis | |
| 7414 | Oil and gas well management, on contract | |
| 3511 | Oil and gas well offshore drilling and production platforms, building | |
| 2924 | Oil and gas well perforating guns, manufacturing | |
| 6302 | Oil and gasoline storage caverns (for hire) | |
| 5141 | Oil bulk station, wholesale | |
| 4530 | Oil burner installation and repair | |
| 2930 | Oil burners, heating, manufacturing | |
| 5143 | Oil burners, wholesale | |
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