| 摘要 |
A shutter having a rectangular frame with side members and end members, and in which at least one of the side members is hollow, and a plurality of louvres extending from one side member to the other side member, and being rotatably mounted in the side members, and a control linkage within at least one of the side members, the control linkage having at least one control element, and each louvre having at least one control member engaging the respective control element, the control members being located spaced radially from the rotation axes of the louvres.
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