TCVN 6384-1998 Article Number and Bar Code The Universal Product Code (UPC-A) Specification《货号和条码 通用产品代码(UPC-A) 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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