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发明名称
Grapple
摘要
申请公布号
US2174076(A)
申请公布日期
1939.09.26
申请号
US19350021180
申请日期
1935.05.13
申请人
BOWEN GEORGE W
发明人
BOWEN GEORGE W.
分类号
E21B31/12
主分类号
E21B31/12
代理机构
代理人
主权项
地址
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