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发明名称
Sealable foot valve
摘要
申请公布号
US1810420(A)
申请公布日期
1931.06.16
申请号
US19280320198
申请日期
1928.11.17
申请人
GETTY FRED I
发明人
GETTY FRED I.
分类号
E21B31/107
主分类号
E21B31/107
代理机构
代理人
主权项
地址
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