| http://www.w3.org/ns/prov#value | - e ???bed plane???, i.e. a surface that coincides with or is situated immediately below the bottom face of the mattress and that is usually constituted by a hard plane made up of several portions, with at least one of these portions being movable so as to occupy positions other than horizontal. [0076] This makes it possible, in particular by tilting up one or another of these portions, to put the m
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