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经营范围
发明名称
Earth boring machine
摘要
申请公布号
US2105587(A)
申请公布日期
1938.01.18
申请号
US19360091434
申请日期
1936.07.18
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
DARNELL EUGENE;ENOCH HENRY L.;GRUBB JOEL N.;FREEMAN ALBERT E.
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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