Corrugated Pipe Culvert, o se ituaiga o inisinia e masani ona faʻaaogaina i foliga o galu-pei o paipa faʻapipiʻi, carbon sila, uʻamea uʻamea, uʻamea, alumini, ma isi. E mafai ona faʻaaogaina i le petrochemical, mea faigaluega, aerospace, kemisi ...
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