A system includes a first bus coupler element, a second bus coupler element, and a visual element associated with the second bus coupler element and including a transparent media enabling the second coupler element to be visually aligned with the first coupler element. The mobile station may generate a first auto correlation function associated with correlation samples over a range of code phases corresponding to a line-of-sight signal. The stress relaxation layer 312b having transparency and the hygroscopic property uses at least one film selected from the group consisting of a film comprising a same material as that of a layer 310, containing an organic compound, sandwiched between a cathode and an anode, a layer capable of being formed by vapor deposition, and a layer capable of being formed by coating. For example, a testing system can generate a PDF report document associated with a test performed, and embed configuration files into the PDF report document. With each interconnection contactor there is associated a device able to prevent the closure of the contactor if its contact terminals are simultaneously energized.