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 Hughes Tool CofiledCriticalHughes Tool Co
Priority to ZA00755804ApriorityCriticalpatent/ZA755804B/en
Publication of ZA755804BpublicationCriticalpatent/ZA755804B/en