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 Harold WaldronfiledCriticalHarold Waldron
Priority to ZA821617ApriorityCriticalpatent/ZA821617B/en
Publication of ZA821617BpublicationCriticalpatent/ZA821617B/en