| http://www.w3.org/ns/prov#value | - ng to a raised position. [0021] In the deployed position, they occupy substantially the entire length of the bed and act like a single full barrier. [0022] By securing the elements to each other in this way, the number of mechanical parts normally associated therewith is reduced by half. [0023] According to a particular characteristic, the number of elements is at least two, one of the elements is
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