Windows can have separate top half and bottom half {window sash}| {sash, window half}. Bottom has cords at two top corners. Cords go through window top-part edge, over pulley in window-frame side, down to weights {sash weight}. Small screwed-on doors are on lower frame sides, allowing access to weights. Sash windows {double hung sash} can move top and bottom panels.
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7-Machine-Kinds-Mechanical-Window
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Date Modified: 2022.0224