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Priority to FI881885ApriorityCriticalpatent/FI88436C/fi
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Publication of FI881885ApublicationCriticalpatent/FI881885A/fi
Publication of FI88436BpublicationCriticalpatent/FI88436B/fi
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Publication of FI88436CpublicationCriticalpatent/FI88436C/fi