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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21/00
Tying-up; Shifting, towing, or pushing equipment; Anchoring
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B63B21/56
Towing or pushing equipment
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B63B21/62
characterised by moving of more than one vessel
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