For an arrangement of {HEAD ~ the elastic elements} substantially radially outside of the impeller wheel, {TAIL ~ the first driving device} extends beyond this impeller wheel 
For an arrangement of { HEAD ~ the elastic elements } substantially radially outside of the impeller wheel , { TAIL ~ the first driving device } extends beyond this impeller wheel
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH