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Priority to FI2502/74ApriorityCriticalpatent/FI55896C/fi
Publication of FI250274A7publicationCriticalpatent/FI250274A7/fi
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Publication of FI55896BpublicationCriticalpatent/FI55896B/fi
Publication of FI55896CpublicationCriticalpatent/FI55896C/fi