| 421 | Opaque Projectors | Company Product |
| 422 | Open Channel | Company Product |
| 423 | Open Channel Flowmeter | Company Product |
| 424 | Open Channel Flowmeters | Company Product |
| 425 | Open Concept Design | Company Product |
| 426 | Open Concept Desking System | Company Product |
| 427 | Open Concept Kitchen Design | Company Product |
| 428 | Open Earth Bucket | Company Product |
| 429 | Open Impeller Centrifugal Pump | Company Product |
| 430 | Open Plan System Office Partition | Company Product |
| 431 | Open Plan System Office Partitions | Company Product |
| 432 | Open Plan System Partitions | Company Product |
| 433 | Open Shelves | Company Product |
| 434 | Open Showcases Freezers | Company Product |
| 435 | Open Side Planing Machines | Company Product |
| 436 | Open Top Containers | Company Product |
| 437 | Opener | Company Product |
| 438 | Operable & Relocatable Wall Partitions | Company Product |
| 439 | Operable & Relocatable Walls | Company Product |
| 440 | Operable Walls | Company Product |
| 441 | Operas | Company Product |
| 442 | Operate & Relocatable Walls | Company Product |
| 443 | Operated Directional Valves | Company Product |
| 444 | Operated Winches Battery | Company Product |
| 445 | Operation Drives | Company Product |
| 446 | Operational Amplifiers | Company Product |
| 447 | Operator User Interface | Company Product |
| 448 | Opf Mixers | Company Product |
| 449 | Ophthalmology | Company Product |
| 450 | Ophthalmology Doctors | Company Product |