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 Richard Alfred Daem, Carl Frederick Wilhelm SuprafiledCriticalRichard Alfred Daem
Priority to ZA847137ApriorityCriticalpatent/ZA847137B/en
Publication of ZA847137BpublicationCriticalpatent/ZA847137B/en