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 John Gilbert SchroderfiledCriticalJohn Gilbert Schroder
Priority to ZA823646ApriorityCriticalpatent/ZA823646B/en
Publication of ZA823646BpublicationCriticalpatent/ZA823646B/en