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发明名称
PRIMARY TRANSFER SUB FOR DUAL CONCENTRIC DRILLPIPE
摘要
申请公布号
ZA7300686(B)
申请公布日期
1974.04.24
申请号
ZA19730000686
申请日期
1973.01.30
申请人
CHAPMAN H;CAN TEX DRILLING AND EXPLORATION LTD
发明人
CHAPMAN H
分类号
E21B;E21C
主分类号
E21B
代理机构
代理人
主权项
地址
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