
Sealing Rings Consisting Of Elastomers For Joints In Sewers And Drains; Circular Of Similar Cross Sections, Technical Specifications For Delivery, Dimensioning
出版:German Institute for Standardisation (Deutsches Institut für Normung)

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Sealing Rings Consisting Of Elastomers For Joints In Sewers And Drains; Circular Of Similar Cross Sections, Technical Specifications For Delivery, Dimensioning
出版:German Institute for Standardisation (Deutsches Institut für Normung)
专家解读视频