Two component coatings having a viscosity range of 6 to 9 wet mils of sag consisting of a base component and an activator component. A first data transmission apparatus changes the number of transmission channels involved in multilink communication from \u201cx\u201d to \u201cy\u201d, acquires SS and SPF associated with the number of transmission channels \u201cy\u201d from an SSSPF table, generates multilink frames based on the acquired SS and SPF, and transmits them to a second data transmission apparatus. The article has been folded about a first, supplemental-fold-region and a second, supplemental-fold-region to provide a preliminary-folded article. By the two hooks, the conductive elastic sheet are buckled into the two windows.