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Priority to DD194174ApriorityCriticalpatent/DD127539A1/xx
Publication of DD127539A1publicationCriticalpatent/DD127539A1/xx
E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
E21B17/046—Couplings; joints between rod or the like and bit or between rod and rod or the like with ribs, pins, or jaws, and complementary grooves or the like, e.g. bayonet catches
