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 A LevyfiledCriticalA Levy
Priority to ZA00745006ApriorityCriticalpatent/ZA745006B/en
Publication of ZA745006BpublicationCriticalpatent/ZA745006B/en
Priority to US05912653prioritypatent/US4202396B1/en