section provided between the openings 8151 and 8152 the top shell 82 comprises a rectangular flat 821 a curved rear extension 822 formed with the flat 821 the extensions 812 and 822 together adapted to clamp a passed cable an elongate lip 823 at a forward end the lip 823 having a groove 8231 in its intermediate portion to be matingly engaged with an outer surface of the sheath 10 the lip 823 adapted to snap onto the bent member 111 the lips 813 and 823 together adapted to prevent a removal of the components provided in the case 8 two sidewalls 824 825 two protuberances 8241 8251 provided on both sidewalls 824 825 adjacent the lips 823 the protuberances 8241 8251 adapted to insert into the openings 132 142 for fastening latches 8242 8252 provided on both sidewalls 824 825 adjacent the protuberances 8241 8251 respectively the latches 8242 8252 adapted to insert into the dents 133 143 for fastening a pair of tabs 8243 8244 provided on the sidewall 824 the tabs 8243 8244 being at the same elevation as the protuberance 8241 and the latch 8242 the tabs 8243 8244 adapted to insert into the openings 8141 8142 for fastening respectively a pair of tabs 8253 8254 provided on the sidewall 825 the tabs 8253 8254 being at the same elevation as the protuberance.