NF R14-306-1978 High frequency electric horn for rated voltages 6 12 or 24 volts 《额定电压6、12或24V“高频”电喇叭》.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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