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发明名称
Drill pipe float valves
摘要
申请公布号
US3058534(A)
申请公布日期
1962.10.16
申请号
US19580731732
申请日期
1958.04.29
申请人
BAKER OIL TOOLS, INC.
发明人
KEITHAHN JULIAN D.
分类号
E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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