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 Hermanus Steyn, Lambertus Nicolaas De Beer, N N OfiledCriticalHermanus Steyn
Priority to ZA967644ApriorityCriticalpatent/ZA967644B/en
Publication of ZA967644BpublicationCriticalpatent/ZA967644B/en