| 摘要 |
<p>An envelope (12) includes a transparent sleeve (14) for holding an overhead projector transparency (18). The envelope further includes at least one transparent flap (16) which is hingedly connected to the sleeve (14) along a long edge thereof. The flap (16) defines a pocket, and a transparent supplemental information sheet or an opaque blocking sheet (20) is inserted into the pocket (46) of the flap for selectively juxtaposing the sheet with the transparency, thereby altering the display.</p> |
