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Application filed by Pekka PulkkinenfiledCriticalPekka Pulkkinen
Priority to FI885937ApriorityCriticalpatent/FI84884C/sv
Publication of FI885937ApublicationCriticalpatent/FI885937A/fi
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Publication of FI84884BpublicationCriticalpatent/FI84884B/fi
Publication of FI84884CpublicationCriticalpatent/FI84884C/sv