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 J De GrootfiledCriticalJ De Groot
Priority to ZA823956ApriorityCriticalpatent/ZA823956B/en
Publication of ZA823956BpublicationCriticalpatent/ZA823956B/en