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发明名称
Valve
摘要
申请公布号
US2642140(A)
申请公布日期
1953.06.16
申请号
US19490101377
申请日期
1949.06.25
申请人
BROWN CICERO C
发明人
BROWN CICERO C.
分类号
E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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