| 摘要 |
In a blind comprising a pair of vertical screens adapted to be rolled up or down on or from a winding drum, said screens consisting either of continuous sheets or of parallel blades adapted to be oriented to permit of controlling the ingress of air and light through the blind, in the closed or unrolled condition thereof, a device for producing the mutual lateral movement of said screens, this device comprising suspension means associated with the winding drum and operatively connected to the winding means whereby the operation of said winding means will both roll up the blind and cause the desired relative lateral movement of said screens.
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