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发明名称
Drill support
摘要
申请公布号
US1833781(A)
申请公布日期
1931.11.24
申请号
US19290342473
申请日期
1929.02.25
申请人
FULLER HENRY W
发明人
FULLER HENRY W.
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
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地址
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