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发明名称
POWER SWIVEL ASSEMBLY FOR A DRILLING RIG
摘要
申请公布号
GB1493717(A)
申请公布日期
1977.11.30
申请号
GB19750038204
申请日期
1975.09.17
申请人
WESTERN GEAR CORP
发明人
分类号
E21B3/02;E21B17/05;E21B19/16;E21B21/00;E21B21/02;(IPC1-7):E21B3/02
主分类号
E21B3/02
代理机构
代理人
主权项
地址
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