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Application filed by Becker Drilling Alberta LtdfiledCriticalBecker Drilling Alberta Ltd
Priority to DK664767ApriorityCriticalpatent/DK131008B/da
Priority claimed from DK664667Aexternal-prioritypatent/DK137553B/da
Publication of DK131008BpublicationCriticalpatent/DK131008B/da
Application grantedgrantedCritical
Publication of DK131008CpublicationCriticalpatent/DK131008C/da