NC 66-34-1986 Electronics Siboney 241 Radio Receiver Quality Specifioations《电子学 “Siboney 241”（西柏尼241）收音机 质量规范》.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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