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Priority to FI881697ApriorityCriticalpatent/FI85197C/fi
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Publication of FI881697ApublicationCriticalpatent/FI881697A/fi
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Publication of FI85197BpublicationCriticalpatent/FI85197B/fi
Publication of FI85197CpublicationCriticalpatent/FI85197C/fi