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发明名称
Equalizing valve
摘要
申请公布号
US2129216(A)
申请公布日期
1938.09.06
申请号
US19360085081
申请日期
1936.06.13
申请人
JOHNSTON MORDICA O
发明人
JOHNSTON MORDICA O.
分类号
E21B34/12;E21B49/08
主分类号
E21B34/12
代理机构
代理人
主权项
地址
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