| 631 | Overhead Showers | Company Product |
| 632 | Overhead Travelling Cranes | Company Product |
| 633 | Overload Device | Company Product |
| 634 | Overload Relays | Company Product |
| 635 | Overvoltage Protection Devices | Company Product |
| 636 | Own Compost | Company Product |
| 637 | Own Email Address | Company Product |
| 638 | Ox | Company Product |
| 639 | Ox Optical | Company Product |
| 640 | Oxalic Acid | Company Product |
| 641 | Oxidizing Biocide | Company Product |
| 642 | Oximeter | Company Product |
| 643 | Oximetry | Company Product |
| 644 | Oxo Bio Trash Bags | Company Product |
| 645 | Oxo Biodegradable Garbage Bags | Company Product |
| 646 | Oxo Biodegradable Trash Bags | Company Product |
| 647 | Oxo Business | Company Product |
| 648 | Oxobusiness | Company Product |
| 649 | Oxy Acetylene Welding | Company Product |
| 650 | Oxy-Hydrogen Flame Generator | Company Product |
| 651 | Oxy-Hydrogen Generator | Company Product |
| 652 | Oxyduo Dissolved Oxygen | Company Product |
| 653 | Oxyferm | Company Product |
| 654 | Oxygen | Company Product |
| 655 | Oxygen Analyser | Company Product |
| 656 | Oxygen Analysers | Company Product |
| 657 | Oxygen Analyzer | Company Product |
| 658 | Oxygen Bank | Company Product |
| 659 | Oxygen Dissolved | Company Product |
| 660 | Oxygen Dissolved Chemicals | Company Product |