China Wired-emergency tele GB Standards Search Result |
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GB/T 19516-2017 Wired-emergency telephone system of expressway 高速公路有线紧急电话系统 - 中英文版 |
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GB/T 19516-2004 The specifications of wired-emergency telephone system of expressway 高速公路有线紧急电话系统技术要求 - 中英文版 |
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