{TAIL ~ The force transmission or transport device} 7, wherein {HEAD ~ the friction clutch} comprises a pair of friction wheels  
{ TAIL ~ The force transmission or transport device } 7 , wherein { HEAD ~ the friction clutch } comprises a pair of friction wheels
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH