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 Amm, D WallacefiledCriticalR Amm
Priority to ZA724448ApriorityCriticalpatent/ZA724448B/en
Publication of ZA724448BpublicationCriticalpatent/ZA724448B/en