ETSI EN 300 356-5-2001 Integrated Services Digital Network (ISDN) Signalling System No 7 (SS7) ISDN User Part (ISUP) Version 4 for the International Interface Part 5 Connected Line_1.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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