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Priority to FI880066ApriorityCriticalpatent/FI79509C/en
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Publication of FI880066ApublicationCriticalpatent/FI880066A/en
Publication of FI79509BpublicationCriticalpatent/FI79509B/en
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Publication of FI79509CpublicationCriticalpatent/FI79509C/en