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15 弁・栓類及び弁室構造 - munakatajimu.or.jp

4-28 2)消火栓、空気弁、排泥弁室 消火栓、空気弁、排泥弁室は、水道用円形鉄蓋(jwwa b 132)と水道用レジンコンクリ-

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