| 摘要 |
A shutter blade device comprises a plurality of shutter blades which are pivotable each about its own tangentially extending pivot axis. Each shutter blade is provided with an elongated extension by means of which it passes through a slot into the interior of the apparatus body where the extension with its terminal portion meshes with an axially movable driver means. The driver means can be actuated electromagnetically or manually. The device is particularly suited for ventilators.
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