| 摘要 |
PROBLEM TO BE SOLVED: To provide an opening section device having excellent heat insulating property though the structure is simple. SOLUTION: This opening section device 10 comprises a frame 12 installed along the four sides of a building opening section and a sash 50 disposed on the inside of the frame. When the sash is closed, all of the stiles 52, 53, 54, 55 of the sash are concealed by the frame when viewed from the front on the indoor side. COPYRIGHT: (C)2010,JPO&INPIT
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