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 GB768171Aexternal-prioritypatent/GB1377211A/en
Application filed by Ici Ltd, Power Gas LtdfiledCriticalIci Ltd
Publication of ZA721974BpublicationCriticalpatent/ZA721974B/en