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An Improved Accessible and Ventilating Trap for Sewers and Drains.
An Improved Accessible and Ventilating Trap for Sewers and Drains.
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机译:改进的下水道和下水道通气陷阱。
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摘要
6599. Hargreaves, F. March 16. Traps.-Interceptors are connected with the surface by one or more pipes having two shafts B, E, for ventilation and inspection, respectively.
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