| 摘要 |
A window rotatable about a pivot point to selectively cover and uncover an opening of a structure, and having at least one operable sash selectively movable within a channel to partially uncover the opening without requiring rotation of the window about the pivot point. The window is preferably configured to rotate inwardly about a top edge whereby the window is protected within the structure when the opening is uncovered by rotation of the window about the pivot point.
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