When the simple wire-pulling device for driving curtain is installed and used, the curtain can be opened towards both sides as required and the curtain can also be opened towards one side.
适合各种规格的窗口使用，安装使用时，根据需要窗帘可以向两边开，也可以向一边开。
2
The sequent wire-pulling is used in electric powered rig as it has smooth lifting system and cross wire-pulling is used in mechanical rig as balanced force relief impact force by compressed ai.