| 511 | Regulators | Company Product |
| 512 | Regulators (built | Company Product |
| 513 | Regulators (panel | Company Product |
| 514 | Rehabilitation Equipment & Supplies | Company Product |
| 515 | Rehabilitation Services | Company Product |
| 516 | Rehardening Filter | Company Product |
| 517 | Reinforced Concrete Piles | Company Product |
| 518 | Reinforced Concrete Pillars | Company Product |
| 519 | Reinforced Hose | Company Product |
| 520 | Reinforced Plastic Pumps | Company Product |
| 521 | Reinforced Soil | Company Product |
| 522 | Reinforced Tapes | Company Product |
| 523 | Reinforced Thermosetting Resin Conduit | Company Product |
| 524 | Reinforcement Bar | Company Product |
| 525 | Reinforcement Bar Coupler | Company Product |
| 526 | Reinforcement L Bracket | Company Product |
| 527 | Reinforcing Bar & Steel Spacers | Company Product |
| 528 | Reinforcing Bar Benders | Company Product |
| 529 | Reinforcing Bar Cutters | Company Product |
| 530 | Reinforcing Mesh Products | Company Product |
| 531 | Reinforcing Wire Mesh | Company Product |
| 532 | Reinjectable Grout Tube | Company Product |
| 533 | Relative Humidity Transmitter | Company Product |
| 534 | Relative Pressure Switches | Company Product |
| 535 | Relay | Company Product |
| 536 | Relay Control Transmitter | Company Product |
| 537 | Relay Controller | Company Product |
| 538 | Relay Covers | Company Product |
| 539 | Relay Fixed | Company Product |
| 540 | Relay Unit | Company Product |