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US20090218139A1 Drilling rigs and erection methods 有权
钻机和架设方法

Drilling rigs and erection methods
摘要:
Systems and methods for erecting a drilling rig. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b).
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