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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
E21B17/0465—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 characterised by radially inserted locking elements
Dispositif écrou de mise en place rapide, à deux demi-écrous, et agencement de blocage notamment pour coffrage de béton, utilisant un tel dispositif écrou