| 摘要 |
<p>Abstract The installation of new, and modification of existing, roller shutters to incorporate a partial opening cutout within the curtain which can be used as an access window or door. The installation of new, and modification of existing, roller shutters to incorporate a partial opening cutout within the curtain which is completely open and framed as a rectangular or square opening. The installation of new, and modification of existing, roller shutters to incorporate a partial opening cutout within the curtain which is completely open but retains the original slats as a modified swinging flap or door</p> |
