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Priority to FI902980ApriorityCriticalpatent/FI89206C/fi
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Publication of FI902980ApublicationCriticalpatent/FI902980A/fi
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Publication of FI89206BpublicationCriticalpatent/FI89206B/fi
Publication of FI89206CpublicationCriticalpatent/FI89206C/fi