▼乙種防火戸2010/01/02 07:19 (C) 株式会社Forex/季楽な家開発奮闘記
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▼乙種防火戸2010/01/02 07:19 (C) 株式会社Forex/季楽な家開発奮闘記
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よみ：おつしゅぼうかと
延焼のおそれのある開口部に用いられる防火戸。