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经营范围
发明名称
Hold-down valve
摘要
申请公布号
US2167415(A)
申请公布日期
1939.07.25
申请号
US19380207104
申请日期
1938.05.10
申请人
CALVERT SEBASTIAN L
发明人
CALVERT SEBASTIAN L.
分类号
E21B23/04
主分类号
E21B23/04
代理机构
代理人
主权项
地址
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