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.)
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Publication date
Application filed by Robertson LtdfiledCriticalRobertson Ltd
Priority to ZA00738173ApriorityCriticalpatent/ZA738173B/en
Priority to JP49121097Aprioritypatent/JPS511670A/ja
Publication of ZA738173BpublicationCriticalpatent/ZA738173B/en