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发明名称
Emergency control apparatus for well pumping and drilling mechanism
摘要
申请公布号
US2199583(A)
申请公布日期
1940.05.07
申请号
US19370167176
申请日期
1937.10.04
申请人
INTERNATIONAL-STACEY CORPORATION
发明人
ATHY CLIFFORD R.
分类号
E21B1/02
主分类号
E21B1/02
代理机构
代理人
主权项
地址
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