{TAIL ~ A device} 1, in which {HEAD ~ the element} permeable to the coolant is a grate 
in
{ TAIL ~ A device } 1 , in which { HEAD ~ the element } permeable to the coolant is a grate
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH REL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH