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Priority to FI890962ApriorityCriticalpatent/FI81847C/fi
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Publication of FI81847BpublicationCriticalpatent/FI81847B/fi
Publication of FI890962ApublicationCriticalpatent/FI890962A/fi
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Publication of FI81847CpublicationCriticalpatent/FI81847C/fi