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 Norsk Hydro AsfiledCriticalNorsk Hydro As
Priority to NO812569ApriorityCriticalpatent/NO149709C/en
Publication of NO812569LpublicationCriticalpatent/NO812569L/en
Publication of NO149709BpublicationCriticalpatent/NO149709B/en
Publication of NO149709CpublicationCriticalpatent/NO149709C/en