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Priority to FI881729ApriorityCriticalpatent/FI81644C/fi
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Publication of FI881729ApublicationCriticalpatent/FI881729A/fi
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Publication of FI81644BpublicationCriticalpatent/FI81644B/fi
Publication of FI81644CpublicationCriticalpatent/FI81644C/fi