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发明名称
IMPROVEMENTS IN METHODS OF PRODUCING A HELICAL THREAD IN METAL TUBES
摘要
申请公布号
GB8924546(D0)
申请公布日期
1989.12.20
申请号
GB19890024546
申请日期
1989.11.01
申请人
CHAMBERS, HARRY D
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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