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发明名称
Drilling bucket
摘要
申请公布号
US1926325(A)
申请公布日期
1933.09.12
申请号
US19300494040
申请日期
1930.11.07
申请人
JOSIE A. BERTRAN
发明人
BERTRAN BENJAMIN E.
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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