| http://www.w3.org/ns/prov#value | - At least two flat metal rings 6 are slidably mounted on the median longitudinal member 23 and are adapted to fix the frame, for example to tabs fixed to the keel bolts or screw-spikes, or to the boat hoisting ring, so as to maintain the frame rigidly in a position as close as possible to the centre of gravity of the boat.
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