A bundle of tubes or pipes is arranged without trenches according to a fluid-assisted drilling method. The supporting members 64, 65 are fixed on copper foil land patterns 62, 63, respectively, by soldering. Two connecting members project respectively rightward and leftward from lower ends of the bracing members. The present invention allows for recognition and optimization of network traffic between network devices without prior configuration. A case for an electronic device with a wireless communication function is also disclosed. The device for controlling the laser unit is connected with a detector that detects the arc voltage or the arc current.