Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Hanoi Sanitation CompanyfiledCriticalHanoi Sanitation Company
Priority to VNHI-026/90UpriorityCriticalpatent/VN12U/en
Publication of VN12UpublicationCriticalpatent/VN12U/en