| 摘要 |
The invention relates to an envelope (1) that is used to send correspondence. Back view of said envelope with the flap unfolded (2) and with the flap folded (2'). View from the top edge (3), which matches the folding line of the flap (2'). View of the flap glued to the envelope (1) in area (4') by means of the adhesive strip (4); view of the flap (2') with its borders resting on (5'). View of the improved envelope (1) having a continuos perforation (3-A) along the edge (3). Said perforation (3-A) can be easily torn, a new feature that is used so that the envelope (1) is opened during appropriate manipulation. The improved envelope also includes special cuts that are not visible from the outside and which underlie area (8). Said cuts are torn when an attempt is made to lift the flap (2'), thereby indicating an attempt at violation in this new state. |
