First transatlantic radio by Guglielmo Marconi. Rapid expansion in the use of private automatic branch exchanges. Development of remote alarm equipment for unattended exchanges.
英
美
释义
古格列尔莫。马可尼首次跨洋传输无线电。用户自动交换机迅速普及。开发无人交换机远端报警设备。
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