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Priority to FI905199ApriorityCriticalpatent/FI87717C/en
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Publication of FI905199ApublicationCriticalpatent/FI905199A/en
Publication of FI87717BpublicationCriticalpatent/FI87717B/en
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Publication of FI87717CpublicationCriticalpatent/FI87717C/en