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Ceiling-mounted, wall-mounted or floor-mounted service units specially adapted for feeding electricity to medical apparatus and devices and/or for transferring signals and/or data to and from medical apparatus, lamps, monitors and/or touchscreens; ceiling-mounted, wall-mounted or floor-mounted service units, comprising racks provided with sockets, plugs and fittings specially adapted for mounting medical apparatus, lamps, monitors and/or touchscreens, for supplying signals and/or data and/or liquids and/or gases to medical apparatus, lamps, monitors and/or touchscreens, and for transferring signals and/or data and/or liquids and/or gases from medical apparatus, lamps, monitors and/or touchscreens; ceiling-mounted, wall-mounted or floor-mounted medical lamps, in particular operatory lamps; ceiling-mounted, wall-mounted or floor-mounted holders and/or pivot arms and/or support arms specially adapted for mounting medical apparatus and devices, lamps, monitors and/or touchscreens; ceiling-mounted, wall-mounted or floor-mounted mounting arms and stands specially adapted for mounting medical apparatus and devices, lamps, monitors and/or touchscreens