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Priority to FI874748ApriorityCriticalpatent/FI88758C/en
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Publication of FI874748ApublicationCriticalpatent/FI874748A/en
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Publication of FI88758BpublicationCriticalpatent/FI88758B/en
Publication of FI88758CpublicationCriticalpatent/FI88758C/en