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 Sang Te YangfiledCriticalSang Te Yang
Priority to SG1997003713ApriorityCriticalpatent/SG72762A1/en
Publication of SG72762A1publicationCriticalpatent/SG72762A1/en