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发明名称
IMPROVEMENTS IN ADAPTORS AND CONNECING PIPES FOR DRILLING EQUIPMENT
摘要
申请公布号
ZA7100974(B)
申请公布日期
1972.03.29
申请号
ZA19710000974
申请日期
1971.02.16
申请人
BRONKHORST J
发明人
BRONKHORST J
分类号
E21B;F16L
主分类号
E21B
代理机构
代理人
主权项
地址
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