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Priority to FI882815ApriorityCriticalpatent/FI80499C/fi
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Publication of FI882815ApublicationCriticalpatent/FI882815A/fi
Publication of FI80499BpublicationCriticalpatent/FI80499B/fi
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Publication of FI80499CpublicationCriticalpatent/FI80499C/fi