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发明名称
Rotary well-drilling apparatus
摘要
申请公布号
US2215047(A)
申请公布日期
1940.09.17
申请号
US19380246423
申请日期
1938.12.17
申请人
MARSHALL JR SAMUEL W
发明人
JR. SAMUEL W. MARSHALL,
分类号
E21B3/04
主分类号
E21B3/04
代理机构
代理人
主权项
地址
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