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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41/00
Drop keels, e.g. centre boards or side boards; ; Collapsible keels, or the like, e.g. telescopically; Longitudinally split hinged keels
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B63B2041/003
Collapsible keels, or the like, e.g. telescopically; Longitudinally split hinged keels
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