In a process and device for extinguishing metal fires, a totally water-free liquid which reacts with the extinguished metal to form a silicate covering the metal fire source is used as extinguishing agent. In the invention, a coordinate system 1 on the basis of landmarks on the bones and a coordinate system 2 on the basis of landmarks on the skins are set in a CT image, and a transformation coefficient Tc between the coordinate system 1 and the coordinate system 2 is calculated and stored. A controller acquires delay information representing the total delay time of the devices connected to the transmission channels conforming to the bidirectional interface and corrects the difference in reproduction time between the video and audio signals by using the acquired delay information. Multiple undercuts may further form tongues with undercuts each of which forms a groove with undercuts on the molded article, andor one or more grooves with undercuts each of which form a tongue with undercuts in the molded article. The associated design data file, manufacturing procedures andor procedures for use of the well tool may be modified based on comparing simulated fluid flow data with desired fluid flow characteristics for the well tool.