. "102887318"@en-us . . . . . "centerboard"@en-us . . "102994012"^^ . "centerboard"^^ . "0.125"^^ . . "02994012-n"^^ . . "a retractable fin keel used on sailboats to prevent drifting to leeward"@en-us . "sliding keel"@en-us . . . . . "0"^^ . "centreboard"@en-us . . "drop keel"@en-us .