After displaying information on the surface of an outer wall of a cell structure, a portion surrounding the displayed information is coated with a coating agent to form a region permeated with a coating agent wherein pores of the outer wall are filled with the coating agent in a section of the outer wall on which the information is displayed. The system includes application specific instruction set processors that provided computation support for the process. The wall plate has a long its vertical axis, a surface of positive first differential and zero second differential, comprised of a combination of splines drawn between points of varying distance from a datum plane. A wiring board captured between the first and second bases has sets of conductive terminal openings at corresponding locations in the board. First and second switches include first and second sets of switch terminals respectively. A transport pipe 3 is connected to an outlet portion 14 of the ejector portion 1.