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发明名称
Automatic chucking device for drill pipes and the like
摘要
申请公布号
US2905998(A)
申请公布日期
1959.09.29
申请号
US19570687396
申请日期
1957.10.01
申请人
ACKER JR WILLIAM L
发明人
JR. WILLIAM L. ACKER,
分类号
E21B3/02
主分类号
E21B3/02
代理机构
代理人
主权项
地址
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