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 Canadian Refractories LtdfiledCriticalCanadian Refractories Ltd
Priority to BE499721ApriorityCriticalpatent/BE499721A/fr
Publication of BE499721ApublicationCriticalpatent/BE499721A/fr