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