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发明名称
Means for producing from spaced oil sands one of which requires pumping
摘要
申请公布号
US2274407(A)
申请公布日期
1942.02.24
申请号
US19390289164
申请日期
1939.08.09
申请人
SECURLTY ENGINEERING CO., INC.
发明人
HAMMER OTTO
分类号
E21B43/14
主分类号
E21B43/14
代理机构
代理人
主权项
地址
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