| 631 | Marine Safety Equipment | Company Product |
| 632 | Marine Safety Testing Services | Company Product |
| 633 | Marine Salvage | Company Product |
| 634 | Marine Salvage Service | Company Product |
| 635 | Marine Sanitary | Company Product |
| 636 | Marine Screed | Company Product |
| 637 | Marine Searchlights | Company Product |
| 638 | Marine Seats | Company Product |
| 639 | Marine Service Stations | Company Product |
| 640 | Marine Services | Company Product |
| 641 | Marine Sewage Treatment Equipment | Company Product |
| 642 | Marine Shipboard Cables | Company Product |
| 643 | Marine Shipboard Instrument Cables | Company Product |
| 644 | Marine Shipboard Power Cables | Company Product |
| 645 | Marine Signalling Lamps | Company Product |
| 646 | Marine Sirens | Company Product |
| 647 | Marine Stainless Steel Fabrication | Company Product |
| 648 | Marine Steering Systems | Company Product |
| 649 | Marine Supplies | Company Product |
| 650 | Marine Surveyors | Company Product |
| 651 | Marine Switches | Company Product |
| 652 | Marine Swivels | Company Product |
| 653 | Marine Systems | Company Product |
| 654 | Marine Tackle | Company Product |
| 655 | Marine Toilets | Company Product |
| 656 | Marine Towing | Company Product |
| 657 | Marine Transmission, Parts & Services | Company Product |
| 658 | Marine Travel Agencies | Company Product |
| 659 | Marine TV Antennas | Company Product |
| 660 | Marine Vacuum | Company Product |