| 421 | Nph Series | Company Product |
| 422 | Npr | Company Product |
| 423 | Npr 71 | Company Product |
| 424 | Npr Piston Rings | Company Product |
| 425 | Npr71 | Company Product |
| 426 | Npt | Company Product |
| 427 | Npw Series | Company Product |
| 428 | Npw Water Pump | Company Product |
| 429 | Nqr | Company Product |
| 430 | Ns | Company Product |
| 431 | Nsk Act Bearings | Company Product |
| 432 | Nsk Bearings | Company Product |
| 433 | Nsk Cylindrical Roller Bearings | Company Product |
| 434 | Nsk Deep Groove Ball Bearings | Company Product |
| 435 | Nsk Flange Ball Bearings | Company Product |
| 436 | Nsk Miniature Ball Bearings | Company Product |
| 437 | Nsk Needle Roller Bearings | Company Product |
| 438 | Nsk Single Tapered Roller Bearings | Company Product |
| 439 | Nsk Single-Direction Thrust Ball Bearings | Company Product |
| 440 | Ntk Ceramic Nozzles | Company Product |
| 441 | Ntn | Company Product |
| 442 | Ntn Bearings | Company Product |
| 443 | Ntuc Plumbing Services Singapore | Company Product |
| 444 | Nu41 | Company Product |
| 445 | Nuclear Counters | Company Product |
| 446 | Nuclear Magnetic Resonance Shielding | Company Product |
| 447 | Nuclear Magnetic Resonance Shielding Systems | Company Product |
| 448 | Nuclear Power Plants | Company Product |
| 449 | Nucleonic Sensors | Company Product |
| 450 | Number & Letter Stamp | Company Product |