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Priority claimed from DE2350318Aexternal-prioritypatent/DE2350318C3/de
Application filed by Opti Holding AgfiledCriticalOpti Holding Ag
Publication of FI289974A7publicationCriticalpatent/FI289974A7/fi
Publication of FI55689BpublicationCriticalpatent/FI55689B/fi
Application grantedgrantedCritical
Publication of FI55689CpublicationCriticalpatent/FI55689C/fi