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Hebei Hankai 35 52 7 seal

2025-08-16 14:34
2025-08-16 13:24
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    Have you ever wondered: “what is a manhole cover?” A manhole cover is a removable plate used to close off an opening to a confined space such as a sewer, utility access point, or storm drain. They are typically round or rectangular and drop into or sit atop an underlying frame or structure. Manhole covers are often made from cast iron, ductile iron, steel, concrete, composite materials, or plastic.