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 Campbell Belman, Singer Proprietary LimitedfiledCriticalCampbell Belman
Priority to ZA843637ApriorityCriticalpatent/ZA843637B/en
Publication of ZA843637BpublicationCriticalpatent/ZA843637B/en