英语翻译Claim:What is claimed is:1.A locking device to screw and to unscrew elements having threaded couplings and belonging to a drill stem,said device being suitable for use in drill rigs comprising arotating head suitable to make said drill st
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![英语翻译Claim:What is claimed is:1.A locking device to screw and to unscrew elements having threaded couplings and belonging to a drill stem,said device being suitable for use in drill rigs comprising arotating head suitable to make said drill st](/uploads/image/z/10719992-56-2.jpg?t=%E8%8B%B1%E8%AF%AD%E7%BF%BB%E8%AF%91Claim%3AWhat+is+claimed+is%3A1.A+locking+device+to+screw+and+to+unscrew+elements+having+threaded+couplings+and+belonging+to+a+drill+stem%2Csaid+device+being+suitable+for+use+in+drill+rigs+comprising+arotating+head+suitable+to+make+said+drill+st)
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