The present invention is a method of solidifying sulfur component being the cause of SOx poisoning by use of a sulfur solidifier. A plastic sheet, preferably polyethylene sheets M and F are adhered onto the rabbeted portions 2 and 3, respectively, of the cement substrate 14. The present invention also provides for the inclusion of shaped charges and booster charges within. The cover sheet includes a passageway portion through which the pulling string is passed on an upper side part thereof and is folded to be accommodated in the window only along the lower edge side of the peripheral edge thereof with the portion of the pulling string which has not yet been activated inserted into the passageway portion so as to be staying therein. New data can be written to the two-terminal memory element by applying a write voltage across the two terminals.