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发明名称
Automatically releasing well head
摘要
申请公布号
US2440015(A)
申请公布日期
1948.04.20
申请号
US19440516833
申请日期
1944.01.03
申请人
LANE-WELLS COMPANY
发明人
MEDDICK LORRAIN D.
分类号
E21B33/072
主分类号
E21B33/072
代理机构
代理人
主权项
地址
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