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发明名称
Device for preventing clogging of drilling bits
摘要
申请公布号
US2293259(A)
申请公布日期
1942.08.18
申请号
US19410385110
申请日期
1941.03.25
申请人
ACME FISHING TOOL COMPANY
发明人
JOHNSON CLYDE D.
分类号
E21B10/18;E21B21/00
主分类号
E21B10/18
代理机构
代理人
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地址
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