| 摘要 |
A window sash in mounted in a window frame by hardware which permits the sash to swing open (1) in an egress mode about an upright axis located closely adjacent one upright side of the frame (2) in a wash mode about an upright axis located near the lateral center of the frame or (3) in an awning mode about a horizontal axis located adjacent the upper side of the frame. All that need be done to change the mode of opening is to switch the position of a single selector lever.
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