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Application filed by Hong Kong & China Gas Co LtdfiledCriticalHong Kong & China Gas Co Ltd
Priority to HK18105953ApriorityCriticalpatent/HK1255517A2/zh
Priority to CN201920655835.9Uprioritypatent/CN211270176U/zh
Publication of HK1255517A2publicationCriticalpatent/HK1255517A2/zh