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发明名称
Valve control apparatus
摘要
申请公布号
US2638110(A)
申请公布日期
1953.05.12
申请号
US19470780177
申请日期
1947.10.16
申请人
PARKS ASBURY S
发明人
PARKS ASBURY S.
分类号
E21B43/12
主分类号
E21B43/12
代理机构
代理人
主权项
地址
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