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Priority claimed from DE3420693Aexternal-prioritypatent/DE3420693A1/en
Application filed by Johann Berger, Josef BergerfiledCriticalJohann Berger
Publication of FI892962ApublicationCriticalpatent/FI892962A/en
Publication of FI892962A0publicationCriticalpatent/FI892962A0/en
Publication of FI88522BpublicationCriticalpatent/FI88522B/en
Application grantedgrantedCritical
Publication of FI88522CpublicationCriticalpatent/FI88522C/en