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发明名称
Well bit
摘要
申请公布号
US2252168(A)
申请公布日期
1941.08.12
申请号
US19400340959
申请日期
1940.06.17
申请人
MARTHA H. WRIGHT
发明人
CRCIGHTON THOMAS A.
分类号
E21B10/00;E21B25/00
主分类号
E21B10/00
代理机构
代理人
主权项
地址
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