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Priority to FI863943ApriorityCriticalpatent/FI76588C/en
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Publication of FI863943ApublicationCriticalpatent/FI863943A/en
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Publication of FI76588BpublicationCriticalpatent/FI76588B/en
Publication of FI76588CpublicationCriticalpatent/FI76588C/en