{HEAD ~ inlets} for external supplies of inert gases in the downward extending section of {TAIL ~ the cylinder}, 
{ HEAD ~ inlets } for external supplies of inert gases in the downward extending section of { TAIL ~ the cylinder } ,
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH