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发明名称
Means for intermittently controlling the flow of fluids
摘要
申请公布号
US2202462(A)
申请公布日期
1940.05.28
申请号
US19380239348
申请日期
1938.11.07
申请人
WILSON SUPPLY COMPANY
发明人
NIXON JEDDY D.
分类号
E21B43/12
主分类号
E21B43/12
代理机构
代理人
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地址
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