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 P TheronfiledCriticalP Theron
Priority to ZA00781623ApriorityCriticalpatent/ZA781623B/en
Priority to GB7909855Aprioritypatent/GB2016284A/en
Priority to DE19792910971prioritypatent/DE2910971A1/en
Publication of ZA781623BpublicationCriticalpatent/ZA781623B/en