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Publication date
Priority claimed from GB3478/74Aexternal-prioritypatent/GB1494102A/en
Application filed by Post OfficefiledCriticalPost Office
Publication of FI791900ApublicationCriticalpatent/FI791900A/fi
Publication of FI63959BpublicationCriticalpatent/FI63959B/fi
Application grantedgrantedCritical
Publication of FI63959CpublicationCriticalpatent/FI63959C/fi