{HEAD ~ The two lateral, elastic retaining elements} are joined in integral manner at {TAIL ~ their rear ends} away from the support shaped section and are mounted in a clamping lock housing also receiving the central retaining element and the rotatable tightening system 
{ HEAD ~ The two lateral , elastic retaining elements } are joined in integral manner at { TAIL ~ their rear ends } away from the support shaped section and are mounted in a clamping lock housing also receiving the central retaining element and the rotatable tightening system
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