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经营范围
发明名称
Subaqueous drilling apparatus
摘要
申请公布号
US3177954(A)
申请公布日期
1965.04.13
申请号
US19560610062
申请日期
1956.09.17
申请人
RAND WILLIAM W
发明人
RAND WILLIAM W.
分类号
E21B7/128
主分类号
E21B7/128
代理机构
代理人
主权项
地址
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