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Priority claimed from DE19732311732external-prioritypatent/DE2311732B2/de
Priority claimed from FI3638/73Aexternal-prioritypatent/FI56639C/fi
Application filed by Petzetakis George AfiledCriticalPetzetakis George A
Publication of FI772482ApublicationCriticalpatent/FI772482A/fi
Publication of FI56640BpublicationCriticalpatent/FI56640B/fi
Application grantedgrantedCritical
Publication of FI56640CpublicationCriticalpatent/FI56640C/fi