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发明名称
Intermittent grip device
摘要
申请公布号
US2258950(A)
申请公布日期
1941.10.14
申请号
US19410387093
申请日期
1941.04.05
申请人
SULLIVAN MACHINERY COMPANY
发明人
CURTIS JOHN C.
分类号
E21B19/081
主分类号
E21B19/081
代理机构
代理人
主权项
地址
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