national standards GB18240.1, GB18240.2. GB18240.3, GB18240.4

GB 18240.1税控收款机：机器规范.doc
GB 18240.2税控收款机：专用IC卡规范.doc
GB 18240.3税控收款机：税控器.doc
GB18240.4税控收款机：银行卡受理设备规范.doc

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