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发明名称
Excavating apparatus
摘要
申请公布号
US2910274(A)
申请公布日期
1959.10.27
申请号
US19560589980
申请日期
1956.06.07
申请人
SCOTT LOREN F
发明人
SCOTT LOREN F.
分类号
E21B7/00
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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