ETSI GSM 09 03-1992 European Digital Cellular Telecommunication System (Phase 1) Requirements on Interworking between the ISDN or PSTN and the PLMN《欧洲数字蜂窝通信系统(第1阶段) ISDN或PSTN和PLMN之.pdf

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ITU-R RAPPORT M 766-2 FRENCH-1990 Feasibility of frequency sharing between the GPS and other services《全球定位系统和其他服务之间的频率共享的可行性》.pdf

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