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Priority claimed from GB61358/68Aexternal-prioritypatent/GB1272232A/en
Application filed by Wiggins Teape Res DevfiledCriticalWiggins Teape Res Dev
Publication of FI56224BpublicationCriticalpatent/FI56224B/fi
Application grantedgrantedCritical
Publication of FI56224CpublicationCriticalpatent/FI56224C/fi