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