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Priority to FI872970ApriorityCriticalpatent/FI79045C/fi
Publication of FI872970A0publicationCriticalpatent/FI872970A0/fi
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Publication of FI79045BpublicationCriticalpatent/FI79045B/fi
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Publication of FI79045CpublicationCriticalpatent/FI79045C/fi
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