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Priority claimed from FI1898/72Aexternal-prioritypatent/FI53715C/fi
Application filed by Continental Oil CofiledCriticalContinental Oil Co
Publication of FI780110A7publicationCriticalpatent/FI780110A7/fi
Application grantedgrantedCritical
Publication of FI56395BpublicationCriticalpatent/FI56395B/fi
Publication of FI56395CpublicationCriticalpatent/FI56395C/fi