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发明名称
Back pressure valve
摘要
申请公布号
US2256119(A)
申请公布日期
1941.09.16
申请号
US19380236173
申请日期
1938.10.21
申请人
LILLICH RALPH A
发明人
LILLICH RALPH A.
分类号
E21B34/06;F16K15/02
主分类号
E21B34/06
代理机构
代理人
主权项
地址
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