SIS SS 2532-1985 Road vehicles - Coupling balls with 60 mm diameter with tapered connection for towed vehicles with a total weight up to 6 tons - Dimensions and strength requiremen.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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