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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17/00
Vessels parts, details, or accessories, not otherwise provided for
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B63B17/0018
Arrangements or devices specially adapted for facilitating access to underwater elements, e.g. to propellers; ; Externally attached cofferdams or the like
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