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Priority to FI896218ApriorityCriticalpatent/FI86919C/en
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Publication of FI896218ApublicationCriticalpatent/FI896218A/en
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Publication of FI86919BpublicationCriticalpatent/FI86919B/en
Publication of FI86919CpublicationCriticalpatent/FI86919C/en