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 Van Der Veen GerritfiledCriticalVan Der Veen Gerrit
Priority to ZA872518ApriorityCriticalpatent/ZA872518B/en
Publication of ZA872518BpublicationCriticalpatent/ZA872518B/en