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Priority to FI881912ApriorityCriticalpatent/FI83931C/fi
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Publication of FI881912ApublicationCriticalpatent/FI881912A/fi
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Publication of FI83931BpublicationCriticalpatent/FI83931B/fi
Publication of FI83931CpublicationCriticalpatent/FI83931C/fi