Small size tunnel driving is a construction technology of underground piping without excavation.
小型隧道掘进是一种无需开挖的地下管道施工技术。
Company to the progress of science and technology as the driving force of technological innovation to transform big, expanding the size of the development of new products.
公司以科技进步为动力，大搞技术革新改造，不断扩大规模，开发新产品。
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