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发明名称
Well plug
摘要
申请公布号
US2507270(A)
申请公布日期
1950.05.09
申请号
US19450607980
申请日期
1945.07.31
申请人
BAKER OIL TOOLS, INC.
发明人
RAGAN THOMAS M.
分类号
E21B33/126
主分类号
E21B33/126
代理机构
代理人
主权项
地址
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