Vessel provided with a mechanism having a first arm which is positioned thereon, and a second arm having a movable extremity distant from the first arm, wherein said first arm and said second arm are connected to each other with at least one link having hinges on opposite sides of said at least one link that connect said link or links to the first arm and second arm respectively, and wherein the length of the second arm is selected so as to arrange that when the hinges on the opposite sides of said links are at the same level, the movable extremity of the second arm is level with a predetermined position within the vessel.
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