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经营范围
发明名称
Gewindeverbindung
摘要
申请公布号
DE820657(C)
申请公布日期
1951.11.12
申请号
DE1950H001192D
申请日期
1950.01.10
申请人
HUGHES TOOL COMPANY
发明人
EVANS SETH
分类号
E21B17/042;E21B17/16;F16B7/18;F16B33/02;F16L15/06
主分类号
E21B17/042
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代理人
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