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发明名称
Derrick construction
摘要
申请公布号
US2164427(A)
申请公布日期
1939.07.04
申请号
US19380220050
申请日期
1938.07.19
申请人
CONSOLIDATED STEEL CORP., LTD.
发明人
RHODES AARON D.
分类号
E21B15/00
主分类号
E21B15/00
代理机构
代理人
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地址
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Fremgangsmåde og anlæg til rensning af vand.
