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发明名称
Earth auger
摘要
申请公布号
US1789399(A)
申请公布日期
1931.01.20
申请号
US19290330448
申请日期
1929.01.05
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
BARTENBACH HERMAN;SPOWART JOHN B.
分类号
E21B10/44
主分类号
E21B10/44
代理机构
代理人
主权项
地址
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