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 Chung Hsing ChangfiledCriticalChung Hsing Chang
Priority to ZA896744ApriorityCriticalpatent/ZA896744B/en
Publication of ZA896744BpublicationCriticalpatent/ZA896744B/en