NF F54-008-1973 Fixed railway installations Signalling Wire transmissions 250 and 400 mm pulleys for chains 《铁路固定装置 信号装置 钢索传动 链用250和400mm滑轮》.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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