▼甲種防火戸2010/01/02 10:21 (C) 株式会社Forex/季楽な家開発奮闘記
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▼甲種防火戸2010/01/02 10:21 (C) 株式会社Forex/季楽な家開発奮闘記
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よみ：こうしゅぼうかと
JISで最も耐火性があると認められている鉄板製の戸。