文件名称：Origin of Mobile Cellular Network Technologies and Markets in Germany and China (2009年)
文件大小：1.29MB
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更新时间：2024-05-13 02:25:02
工程技术 论文
The inventive foundation of mobile cellular technologies was laid about 100 years ago. Wireless voice service was commercialised in the 1940s by AT&T. In Germany, public and non-cellular wireless service was established by Deutsche Bundespost in the late