tussenvloer (zn):
entresol(en) intermediate floor or storey in between the main floors of a building; specifically, one that is directly above the ground floor which does not extend over the whole floorspace of the building., mezzanine(en) intermediate floor or storey in between the main floors of a building; specifically, one that is directly above the ground floor which does not extend over the whole floorspace of the building.
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Via: Memodata.com