A process for the separation of metals from a ferrite or a roasted metal sulphide ore is carried out by leaching the ferrite or roasted ore with peroxysulphuric acid and separating therefrom a solution containing metals. It comprises: making the vulcanized rubber molding by vulcanization molding, forming an adhesive layer, whose principal ingredient is chlorosulfonated polyethylene, on a surface of the rubber molding to be bonded to the resin, and while arranging the rubber molding in a mold, pouring the thermoplastic resin containing 3060 wt. The extension is a telephone extension of the user and the PIN can be administratively assigned. The outer tube is split longitudinal, and a first spring biases the slit into an open orientation.