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When we open the envelope, it's easy to tear the letter if the size of letter is just a bit smaller than the size of envelope. The letter-protect envelope solves the problem. There is a plastic tape pasting on the inside of the front cover and the tape is parallel to the edge of the front cover. One end of the plastic tape is outside of the envelope. We can take the end to open the envelope but not tear the letter.
Tang Zhichuan, Cao Hongxin, Shen Jiaoqi, Zeng Xianwei