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Priority to FI881242ApriorityCriticalpatent/FI88135C/fi
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Publication of FI881242ApublicationCriticalpatent/FI881242A/fi
Publication of FI88135BpublicationCriticalpatent/FI88135B/fi
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Publication of FI88135CpublicationCriticalpatent/FI88135C/fi