|
| 2411 | Oak extract, manufacturing | |
| 2029 | Oars, wood, manufacturing | |
| 0111 | Oat farming | |
| 1531 | Oatmeal (i.e., cereal breakfast food), manufacturing | |
| 0111 | Oats for fodder, growing | |
| 0111 | Oats for grain, growing | |
| 1531 | Oats, breakfast cereal, manufacturing | |
| 1531 | Oats, rolled (i.e., cereal breakfast food), manufacturing | |
| 5121 | Oats, wholesale | |
| 0140 | Obedience training services, pet | |
| 5240 | Objects of art, antique, retail | |
| 3692 | Oboes, manufacturing | |
| 9249 | Observation tower operation | |
| 7310 | Observatories, astronomical | |
| 8511 | Obstetrical hospital | |
| 8512 | Obstetricians' offices | |
| 3692 | Ocarinas, manufacturing | |
| 3610 | Occasional chairs, household, upholstered, manufacturing | |
| 1730 | Occupational clothing, made in knitting mills | |
| 1810 | Occupational clothing, women's, misses' and girls', cut and sewn from purchased fabric | |
| 7421 | Occupational health and safety consulting services | |
| 7421 | Occupational health and well being consultant | |
| 7513 | Occupational safety and health standards services, federal government | |
| 7513 | Occupational safety and health standards services, provincial government | |
| 9112 | Occupational therapists' associations | |
| 8519 | Occupational therapists, offices of | |
| 6110 | Ocean shipping, freight | |
| 6110 | Ocean transportation, passenger | |
| 6110 | Ocean-borne transportation | |
| 7421 | Oceanic surveying (except geophysical) services | |
| 7421 | Oceanic surveying, geophysical | |
| 7310 | Oceanographic research and development laboratories | |
| 1421 | Ocher mining | |
| 2411 | Ochre pigments, manufacturing | |
| 3692 | Octophones, manufacturing | |
| 8512 | Oculists' offices | |
| 8512 | Oculists, private practice | |
| 3312 | Odometers, manufacturing | |
| 2927 | Oerlikon guns, manufacturing | |
| 8532 | Offender rehabilitation agencies | |
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