| More topics under "B63 - Ships or other waterborne vessels; Related equipment" (139,766) |
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| B63B - Ships or other waterborne vessels; Equipment for shipping (75,973) |
| B63C - Launching, hauling-out, or dry-docking of vessels; Life-saving in water; Equipment for dwelling or working under water; Means for salvaging or searching for underwater objects (17,077) |
| B63G - Offensive or defensive arrangements on vessels; Mine-laying; Mine-sweeping; Submarines; Aircraft carriers (4,993) |
| B63H - Marine propulsion or steering (38,596) |
| B63J - Auxiliaries on vessels (3,127) |