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1975年5月美国矿业局(USBM)主持了一次矿山通讯技术会议,在会上简要地总结了过去5年中美国矿业局的通讯技术发展情况。现分以下几方面进行讨论:一、钻孔机操作人员用的超高频无线电设备
In May 1975, the United States Bureau of Mines (USBM) hosted a mine communications technology conference where a brief summary of the development of communications technology at the US Bureau of Mines during the past five years was presented. The following points are discussed in the following points: First, the drilling machine operator with ultra-high frequency radio equipment