A structural component with a tubular section, particularly a structural component of a fluid line, has at least two materials with different stiffness andor creeping strength, wherein the materials include thermoplastic synthetic materials and wherein the material having the greater stiffness andor creeping strength is embedded in the other material. In disclosed embodiments, base files of a client are stored on a server and are accompanied by tokens uniquely identifying the base files. At each end of the input arm, a first and second CVT shaft is rotatably mounted, with the axes of the CVT shafts extending parallel to the input shaft. The external communications system then places a distress call, which may be responded to by the appropriate medical personnel.