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