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Application filed by Becker Drilling Alberta LtdfiledCriticalBecker Drilling Alberta Ltd
Priority to DK664667ApriorityCriticalpatent/DK137553B/en
Priority to DK664767Aprioritypatent/DK131008B/en
Publication of DK137553BpublicationCriticalpatent/DK137553B/en
Application grantedgrantedCritical
Publication of DK137553CpublicationCriticalpatent/DK137553C/da