| 601 | Over Spectacles | Company Product |
| 602 | Over Voltage Relay | Company Product |
| 603 | Overalls | Company Product |
| 604 | Overboard Discharge Monitors | Company Product |
| 605 | Overcurrent Relay | Company Product |
| 606 | Overfill Sensors | Company Product |
| 607 | Overflow Valve | Company Product |
| 608 | Overhaul | Company Product |
| 609 | Overhaul And Repair | Company Product |
| 610 | Overhead Chain Conveyors | Company Product |
| 611 | Overhead Crane Parts | Company Product |
| 612 | Overhead Cranes | Company Product |
| 613 | Overhead Doors | Company Product |
| 614 | Overhead Guards | Company Product |
| 615 | Overhead Monorail Geared Motors | Company Product |
| 616 | Overhead Projectors | Company Product |
| 617 | Overhead Rotation Clamps | Company Product |
| 618 | Overhead Sectional Doors | Company Product |
| 619 | Overhead Showers | Company Product |
| 620 | Overhead Travelling Cranes | Company Product |
| 621 | Overload Device | Company Product |
| 622 | Overload Relays | Company Product |
| 623 | Overvoltage Protection Devices | Company Product |
| 624 | Own Compost | Company Product |
| 625 | Own Email Address | Company Product |
| 626 | Ox | Company Product |
| 627 | Ox Optical | Company Product |
| 628 | Oxalic Acid | Company Product |
| 629 | Oxidizing Biocide | Company Product |
| 630 | Oximeter | Company Product |