| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to open an envelope after checking its contents, by solving the problem in which a received conventional envelope is opened as its contents cannot be checked before it is opened. SOLUTION: One side of the envelope is transparent. A paper 1 is attached onto the transparent side with an adhesive double-sided sheet, bonding sheet, or the like. COPYRIGHT: (C)2004,JPO
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