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Priority claimed from FR7639554Aexternal-prioritypatent/FR2376287A1/fr
Application filed by Elf AquitainefiledCriticalElf Aquitaine
Publication of MX5000EpublicationCriticalpatent/MX5000E/es
Fremgangsmade til frembringelse af huller med forudbestemt, vilkarlig yderkontur, fortrinsvis i bjerg- eller jordformationer, og boremaskine til brug ved udovelse af fremgangsmaden