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发明名称
Preset releasing sub assembly
摘要
申请公布号
US2597414(A)
申请公布日期
1952.05.20
申请号
US19480001722
申请日期
1948.01.12
申请人
WAGGENER KENNETH E
发明人
WAGGENER KENNETH E.
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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