| 421 | Ntn Bearings | Company Product |
| 422 | Ntuc Plumbing Services Singapore | Company Product |
| 423 | Nu41 | Company Product |
| 424 | Nuclear Counters | Company Product |
| 425 | Nuclear Magnetic Resonance Shielding | Company Product |
| 426 | Nuclear Magnetic Resonance Shielding Systems | Company Product |
| 427 | Nuclear Power Plants | Company Product |
| 428 | Nucleonic Sensors | Company Product |
| 429 | Number & Letter Stamp | Company Product |
| 430 | Number Combination Locks | Company Product |
| 431 | Number Embossing Machines | Company Product |
| 432 | Numerically Controlled Boring Machines | Company Product |
| 433 | Numerically Controlled Lathes | Company Product |
| 434 | Numerically Controlled Milling Machines | Company Product |
| 435 | Nurse Call Systems | Company Product |
| 436 | Nurseries Schools | Company Product |
| 437 | Nurses | Company Product |
| 438 | Nursing Agencies | Company Product |
| 439 | Nursing Homes | Company Product |
| 440 | Nut | Company Product |
| 441 | Nut And Bolt Checkers | Company Product |
| 442 | Nut And Bolt Feeders | Company Product |
| 443 | Nut Driver | Company Product |
| 444 | Nut Electrode Cover | Company Product |
| 445 | Nutrition Consultants | Company Product |
| 446 | Nutritional Labelling | Company Product |
| 447 | Nutritional Test | Company Product |
| 448 | Nutritive Moisturizing Shampoo | Company Product |
| 449 | Nutritive Repairing Conditioner | Company Product |
| 450 | Nutritive Rich Moisturiser | Company Product |