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经营范围
发明名称
MAKING AND BREAKING SCREW COUPLINGS
摘要
申请公布号
GB8321796(D0)
申请公布日期
1983.09.14
申请号
GB19830021796
申请日期
1983.08.12
申请人
CHRISTENSEN INC
发明人
分类号
E21B19/16;(IPC1-7):E21B19/16
主分类号
E21B19/16
代理机构
代理人
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地址
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