The high bending elasticity results in {HEAD ~ a long average service life} and, in {TAIL ~ conjunction} with a low stretch related slip and correspondingly small speed loss, in a high degree of efficiency 
The high bending elasticity results in { HEAD ~ a long average service life } and , in { TAIL ~ conjunction } with a low stretch related slip and correspondingly small speed loss , in a high degree of efficiency
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH