| 摘要 |
A door has a frame forming an opening of the door, a window unit rotatably attached to the frame for positioning in the opening of the frame, a retainer moveably mounted on the frame, and an operator for operating the retainer. The retainer is moveable from a released position wherein the retainer is disengaged from the window unit, to a retaining position, wherein the retainer engages the window unit to hold the window unit in the opening. |
