| 511 | Carbon Composition | Company Product |
| 512 | Carbon Dioxide Analysers | Company Product |
| 513 | Carbon Dioxide Blocks | Company Product |
| 514 | Carbon Dioxide Co2 | Company Product |
| 515 | Carbon Dioxide Detectors | Company Product |
| 516 | Carbon Dioxide Fire Extinguishers | Company Product |
| 517 | Carbon Dioxide Gas - Distributors | Company Product |
| 518 | Carbon Dioxide Gas Manufacturers | Company Product |
| 519 | Carbon Film | Company Product |
| 520 | Carbon Filter | Company Product |
| 521 | Carbon Monoxide Analysers | Company Product |
| 522 | Carbon Monoxide Co | Company Product |
| 523 | Carbon Packings | Company Product |
| 524 | Carbon Products | Company Product |
| 525 | Carbon Removers | Company Product |
| 526 | Carbon Steel | Company Product |
| 527 | Carbon Steel Bars | Company Product |
| 528 | Carbon Steel Bushing | Company Product |
| 529 | Carbon Steel Fabricators | Company Product |
| 530 | Carbon Steel Heat Treatment | Company Product |
| 531 | Carbon Steel Pipe | Company Product |
| 532 | Carbon Steel Pipe Benders | Company Product |
| 533 | Carbon Steel Pipe Fittings | Company Product |
| 534 | Carbon Steel Pipes | Company Product |
| 535 | Carbon Steel Plate | Company Product |
| 536 | Carbon Steel Rails | Company Product |
| 537 | Carbon Steel Silo | Company Product |
| 538 | Carbon Steel Valves | Company Product |
| 539 | Carbon Teflon | Company Product |
| 540 | Carbon Tetrachloride | Company Product |