Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B63
SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
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B63B
SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
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13/00
Conduits for emptying or ballasting; Self-bailing equipment; Scuppers
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B63B13/02
Ports for passing water through vessels' sides
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