About USUDA TOSHIYUKI
About 大阪市 建設局
About sewer pipe
About facility and building
About Water Quality
About combined sewerage
About shield tunneling
About Osaka prefecture
About rainwater storage facility
About slurry shield method
About river water quality
About Tunneling work
About Sewerage engineering and wastewater treatment in general
About 地下空間
About 土木施工
About 水質保全
About 力
About 下水
About 建設
About 貯留管
About 築造
About 工事