| 摘要 |
The slat for the shutter of the flexible door (100) has a longitudinal slot (14) across it. A long enlarging lens (200) is held entirely in the slot to reduce wear on it. The door has an outer surface (101) and an inner surface (102) and the slot is between them. The slot has two narrow lateral extensions (143) at its ends that are in the inner surface of the door. The lens is flexible and has two end parts (202) which engage in the extensions of the slot,
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