A transmission line guide chain includes a plurality of connected chain links that define a through-passage to receive transmission lines. Instead, a trip coil of the instantaneous tripping device is connected to a main circuit via a connection conductor of a low resistance, a test-tripping part is mounted in place of the shifter of the differential shifter mechanism, and the adjustment dial is replaced with a dummy dial. A cancellation sound signal generator is configured to generate a cancellation sound signal representing a cancellation sound to cancel the alert sound, which has been transferred from the outside of the vehicle to an inside of the vehicle, at a sound cancellation target position inside the vehicle. The wireless device receives a resource assignment for data packet. The foam element has a first side supported on the foam element engaging surface, a second side opposite the first side, and a peripheral edge at least partially enclosed by the retaining wall. The image processing method includes receiving an image signal an image, detecting a feature of the image, and analyzing the image signal based on the detected feature of the image, performing segmentation on the image signal according to the analysis result, and performing image processing on the image signal according to the segmentation result.