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鞍钢大孤山铁矿、锦州无线电四厂和鞍山矿山设计院的广大革命职工,在批林整风、批林批孔运动的推动下,为了解决露天矿山移动设备的通讯问题,经过一年半的共同努力,试制成功KZD-20型矿用载波调度电话机,目前已在大孤山铁矿使用。鞍钢矿山公司和锦州市电子局于1975年1月29日至2月1日先后在鞍山
Anshan Iron and Steel Dagushan, Jinzhou Radio IV Factory and Anshan Mining Design Institute of the revolutionary workers, in the rectification of forest rectification, Lin Chi approved Pok campaign, in order to solve the communication problems of open pit mine mobile devices, after a year and a half Work together, trial success KZD-20 mining carrier scheduling telephone, has been used in Dagushan iron ore. Anshan Iron and Steel Company and Jinzhou Electronic Bureau in January 29, 1975 to February 1 in Anshan