{HEAD ~ at least one stage} of {TAIL ~ a second turbine impeller} affixed to the rotating shaft that extends through the second turbine impeller, the second turbine impeller being arranged downstream of the first turbine impeller, 
of
{ HEAD ~ at least one stage } of { TAIL ~ a second turbine impeller } affixed to the rotating shaft that extends through the second turbine impeller , the second turbine impeller being arranged downstream of the first turbine impeller ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH