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美国伊利诺州艾尔兰1号煤矿正在试验和安装一种使用开槽式泄漏电缆的移动式无线电通讯系统。井下管理人员即使处在讯号失落区或远离传呼电话及扩音电话时,也能实现相互间的通讯联络。
The Irish 1 Coal Mine in Illinois, Illinois, is testing and installing a mobile radiocommunication system that uses slotted leak cables. Downhole managers can communicate with each other even when they are in the signal loss area or away from paging and PA phones.