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发明名称
Bohrstrangventil
摘要
申请公布号
DE1128377(B)
申请公布日期
1962.04.26
申请号
DE1959H036957
申请日期
1959.07.17
申请人
HYDRIL COMPANY
发明人
KNOX GRANVILLE SLOAN
分类号
E21B21/10;E21B33/06;E21B34/00
主分类号
E21B21/10
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代理人
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