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Priority to FI773256ApriorityCriticalpatent/FI59761C/fi
Priority to SU782681051Aprioritypatent/SU1327785A3/ru
Publication of FI773256ApublicationCriticalpatent/FI773256A/fi
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Publication of FI59761BpublicationCriticalpatent/FI59761B/fi
Publication of FI59761CpublicationCriticalpatent/FI59761C/fi