| 摘要 |
<p>The invention relates to an envelope comprising: a front surface and a rear surface defining an internal cavity which is open at at least one of the ends thereof; an endless strip of flexible material which is disposed such that it can rotate about the front surface of the envelope and which includes two consecutive longitudinal zones bearing different printed designs; a flat body which is housed inside the internal cavity and which can move longitudinally between a visible position, in which it projects from the envelope, and a concealed position, in which it is arranged inside the envelope; and fixing means for joining the rear end of the flat body to the endless strip and enabling the endless strip to rotate about the front surface.</p> |
