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WhatsApp: +86 18203695377As shown in Fig. 3, the executive layer mainly consists of trackless mining equipment such as rockdrilling jumbos, DTH drills, underground scrapers, underground mining trucks, or underground charging transport layer mainly includes a ubiquitous informationacquisition system, wireless communication system, and precise positioning and intelligent navigation system.
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WhatsApp: +86 18203695377drill rod to reduce the energy loss of flushing fluid. The strength of thread and whole tension and torsion of drill rod are guaranteed by optimal material and advanced process. It is shown as Fig. 3.
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WhatsApp: +86 18203695377A coal mining car at Lackawanna Coal Mine in Scranton, Pennsylvania Coal miners exiting a winder cage at a mine near Richlands, ia in 1974 Surface coal mining in Wyoming, A coal mine in Frameries, Belgium. Coal mining is the process of extracting coal from the ground or from a mine. Coal is valued for its energy content and since the 1880s has been widely used to generate electricity.
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