| 摘要 |
The holder consists of a supple plastic wallet (1, 2) with an opaque inner sheet (4), fastened to the spine (3) of a book, and a movable insert that is at least partialy transparent. The insert is in the form of two sheets (7, 8) joined by their outer edges (9), inserted into the wallet so they are located on either side of the opaque sheet. The upper sheet (7) is transparent with opaque graphics, and the lower one (8) has complementary graphics.
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