|
| 3823 | Nail heading machine manufacturing | |
| 3710 | Nail manufacturing in steel works or rolling mill | |
| 3819 | Nail manufacturing, not in steel works or rolling mill | |
| 3909 | Name plate, metal, excluding engraved, manufacturing | |
| 3212 | Napkin, except sanitary, cutting and sewing | |
| 3419 | Napkin, paper, manufacturing | |
| 3211 | Napped fabric manufacturing | |
| 3824 | Napping machine manufacturing | |
| 3530 | Naptha manufacturing | |
| 3211 | Narrow fabric manufacturing | |
| 9100 | National defence department | |
| 9100 | National government administration | |
| 3511 | Natural acetic acid manufacturing | |
| 3511 | Natural acetone manufacturing | |
| 3692 | Natural cement manufacturing | |
| 3112 | Natural cheese manufacturing | |
| 3511 | Natural dyestuff manufacturing | |
| 1120 | Natural fresh fertilizer gathering | |
| 7115 | Natural gas distribution through pipeline | |
| 4102 | Natural gas distribution, except through pipeline | |
| 2200 | Natural gas extraction | |
| 7115 | Natural gas pipeline operation | |
| 2200 | Natural gas well operations | |
| 3699 | Natural graphite grinding and refining, not at mine, pit or quarry | |
| 3121 | Natural ice gathering | |
| 7192 | Natural ice storage service | |
| 3134 | Natural mineral water carbonating | |
| 2901 | Natural sand, other than metal-bearing, quarrying | |
| 2902 | Natural, ancient, fertilizer gathering | |
| 9331 | Naturopath, own account | |
| 3851 | Nautical instrument manufacturing | |
| 3829 | Naval artillery manufacturing | |
| 9331 | Naval hospital | |
| 3511 | Naval store, gum, processing | |
| 3511 | Naval store, wood, manufacturing | |
| 5000 | Navigation channel construction | |
| 3851 | Navigational instrument manufacturing | |
| 9100 | Navy | |
| 9399 | Navy service club | |
| 3115 | Neats-foot oil manufacturing | |
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