A method includes forming a layer of silicon oxynitride, silicon rich nitride or silicon nitride over a layer of semiconducting material. A user can thus utilize or process the contents of a recorded telephone call in the same way, irrespective of whether the user has performed the telephone call at a remote location using a mobile telephone or by using an internal telephone. The sealed capsule is prepared for use by removal of the sealed needle sheath. The transfer structure is provided with tilted non-driven guide rollers in an angle sector between the two revolving belts of the first twin-belt conveyor. The film can be coagulated to form a permeable separator uniformly conforming to and covering the electrode surface irrespective of the shape and contour of the electrode. The panels each have a core of insulative material and outer laminate layers laminated to the core.