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Application filed by Arvi A R Roennholm, Pekka Murtomaeki, Aulis AnttilafiledCriticalArvi A R Roennholm
Priority to FI812551ApriorityCriticalpatent/FI63994C/en
Publication of FI812551LpublicationCriticalpatent/FI812551L/en
Application grantedgrantedCritical
Publication of FI63994BpublicationCriticalpatent/FI63994B/en
Publication of FI63994CpublicationCriticalpatent/FI63994C/en