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Priority claimed from FI874009Aexternal-prioritypatent/FI81447C/en
Application filed by Ilmaterae OyfiledCriticalIlmaterae Oy
Publication of NO901181D0publicationCriticalpatent/NO901181D0/en
Publication of NO901181LpublicationCriticalpatent/NO901181L/en
Publication of NO169408BpublicationCriticalpatent/NO169408B/en
Publication of NO169408CpublicationCriticalpatent/NO169408C/en