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.)
Filing date
Publication date
Application filed by Hung Y, Chang LfiledCriticalHung Y
Priority to ZA703608ApriorityCriticalpatent/ZA703608B/en
Publication of ZA703608BpublicationCriticalpatent/ZA703608B/en