| 摘要 |
An advertising device includes an envelope having a front panel and a back panel, the front panel including an envelope window dimensioned to reveal first advertising information on an interior wall of the back panel. A slider is slidably disposed in the envelope and has a slider window that is dimensioned to reve al only a portion of the first advertising information depending upon its position in the envelope. The slider is moveable by a user of the advertising device.</SDOAB >
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