| 摘要 |
2123511 9312454 PCTABS00023 A rectangular, transparent envelope (10) sized to receive a transparent sheet having indicia for projection, the envelope being attached to a backing (8) having perforations (9) allowing the backing to be attached to a ring binder (3). The envelope (10) may be folded at its attachment to the backing for storage in the binder (3) or unfolded to be placed on a projector (1) located next to the binder.
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