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 R WilkinfiledCriticalR Wilkin
Priority to ZA704059ApriorityCriticalpatent/ZA704059B/en
Priority to GB20470/71Aprioritypatent/GB1293773A/en
Publication of ZA704059BpublicationCriticalpatent/ZA704059B/en