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 Robert John WalkerfiledCriticalRobert John Walker
Priority to ZA9700387ApriorityCriticalpatent/ZA97387B/en
Publication of ZA97387BpublicationCriticalpatent/ZA97387B/en