• Emergency vent Manhole Cover is a kind of rapid relief-pressure device. Its technical performance, main material and main parts'materialare the same as HXF-HR type breather manholes.

    紧急放空人孔快速泄压装置技术性能主要零部件材料HXF-HR呼吸人孔相同

    youdao

  • Emergency vent Manhole Cover is a kind of rapid relief-pressure device. Its technical performance, main material and main parts'materialare the same as HXF-HR type breather manholes.

    紧急放空人孔快速泄压装置技术性能主要零部件材料HXF-HR呼吸人孔相同

    youdao

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