| 631 | Marine Propulsion Diesel Engines | Company Product |
| 632 | Marine Protection | Company Product |
| 633 | Marine Pumps | Company Product |
| 634 | Marine Radio Communication Equipment & Systems | Company Product |
| 635 | Marine Refrigeration Repair | Company Product |
| 636 | Marine Refrigeration Servicing | Company Product |
| 637 | Marine Repair | Company Product |
| 638 | Marine Repair Tapes | Company Product |
| 639 | Marine Resin Floor | Company Product |
| 640 | Marine Reupholstering | Company Product |
| 641 | Marine Rope | Company Product |
| 642 | Marine Ropes | Company Product |
| 643 | Marine Rudder & Tail Shaft | Company Product |
| 644 | Marine Rudders | Company Product |
| 645 | Marine Safety | Company Product |
| 646 | Marine Safety Equipment | Company Product |
| 647 | Marine Safety Testing Services | Company Product |
| 648 | Marine Salvage | Company Product |
| 649 | Marine Salvage Service | Company Product |
| 650 | Marine Sanitary | Company Product |
| 651 | Marine Screed | Company Product |
| 652 | Marine Searchlights | Company Product |
| 653 | Marine Seats | Company Product |
| 654 | Marine Service Stations | Company Product |
| 655 | Marine Services | Company Product |
| 656 | Marine Sewage Treatment Equipment | Company Product |
| 657 | Marine Shipboard Cables | Company Product |
| 658 | Marine Shipboard Instrument Cables | Company Product |
| 659 | Marine Shipboard Power Cables | Company Product |
| 660 | Marine Signalling Lamps | Company Product |