This mechanism comprises several assemblies of links bearing on {HEAD ~ the tube section} on {TAIL ~ either side} of the weakened zone and a bearing surface formed in a sleeve fixed with respect to the ground and with which is in contact a protuberance formed on one of the links of each assembly  
on
This mechanism comprises several assemblies of links bearing on { HEAD ~ the tube section } on { TAIL ~ either side } of the weakened zone and a bearing surface formed in a sleeve fixed with respect to the ground and with which is in contact a protuberance formed on one of the links of each assembly
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH OTH