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
Priority claimed from US05/554,828external-prioritypatent/US3994127A/en
Application filed by R GowerfiledCriticalR Gower
Publication of ZA754380BpublicationCriticalpatent/ZA754380B/en