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Application filed by Viljo Olavi Johannes HellstenfiledCriticalViljo Olavi Johannes Hellsten
Priority to FI890939ApriorityCriticalpatent/FI82749C/fi
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Publication of FI890939ApublicationCriticalpatent/FI890939A/fi
Publication of FI82749BpublicationCriticalpatent/FI82749B/fi
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Publication of FI82749CpublicationCriticalpatent/FI82749C/fi