During such engagement, a high degree of friction is created between the fingers and the transverse wires with which they are engaged, thus assuring a secure connection between {HEAD ~ the mats} of successive lifts of {TAIL ~ the wall} 
During such engagement , a high degree of friction is created between the fingers and the transverse wires with which they are engaged , thus assuring a secure connection between { HEAD ~ the mats } of successive lifts of { TAIL ~ the wall }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL