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Priority to FI841121ApriorityCriticalpatent/FI72538C/en
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Publication of FI841121ApublicationCriticalpatent/FI841121A/en
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Publication of FI72538BpublicationCriticalpatent/FI72538B/en
Publication of FI72538CpublicationCriticalpatent/FI72538C/en