| 摘要 |
<p>This invention concerns a special sheet of paper consisting of two consecutive pieces of paper separated by a transverse perforated line, the first piece of paper designed to act as an envelope and the second as the writing paper on which to print messages or other communications; both being provided with transverse folding lines which allow the insertion of the writing paper part into the envelope part so as to form an envelope ready for mailing. <IMAGE></p> |
