In an advantageous embodiment of the invention, {HEAD ~ a draft shield element} is configured essentially as {TAIL ~ a hollow body} consisting in particular of glass 
is configured essentially as
In an advantageous embodiment of the invention , { HEAD ~ a draft shield element } is configured essentially as { TAIL ~ a hollow body } consisting in particular of glass
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH