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Cast iron/concrete composite manhole cover is a national patent product with Patent No. (ZL.???????????????????^invented by Mr. Ma Donghai, the manager of Dongma Concrete Components Co., Ltd. More than 80,000 manhole covers have been used here and there since 1997. It is proved that this type of patented manhole covers is reliable, durable, wear-resistance, beautiful and cheap, the desirable replacement of cast iron manhole cover. Hence, in No.????????-???? document transferred by Dalian Construction Committee recommend this type of cast iron/concrete composite manhole cover. Many media such as CCTV Xinghuo Science & Technology Program, Dalian TV, Liaoning TV Evening News and Xinhua News Agency also reported this type of product. This type of manhole cover is very popular for its wonderful advantages. But many counterfeit ones appeared in the market at the same time, which bring us lots troubles. While purchasing, please check out whether there are words as follows on the products instruction, No. ????????-???? document, cast iron/concrete composite manhole covers is the sole manhole cover product recommended by Dalian People Government. It is the patent of Dongma Concrete Components Co., Ltd.
Cast iron/concrete composite manhole cover is a national patent product with Patent No. (ZL.???????????????????^invented by Mr. Ma Donghai, the manager of Dongma Concrete Components Co., Ltd. More than 80,000 manhole covers have been used here and there since 1997.