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发明名称
Method for forming a pipe centering device
摘要
申请公布号
US3270697(A)
申请公布日期
1966.09.06
申请号
US19620227805
申请日期
1962.10.02
申请人
B & W INCORPORATED
发明人
SOLUM JAMES R.
分类号
E21B17/10
主分类号
E21B17/10
代理机构
代理人
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