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一种给排水管道过土工膜的防渗防锈法兰设计

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First Author:Pan Baofeng

Disigner of the Invention:Du Zhida

Application Number:CN201210380034.9

Authorization Date:2012-09-29

Authorization number:CN102878386A

Pre One:用于碾压混凝土施工的斜层平推铺筑法
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