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发明名称
Auger drill
摘要
申请公布号
US1800344(A)
申请公布日期
1931.04.14
申请号
US19270175320
申请日期
1927.03.14
申请人
THE GARDNER-DENVER COMPANY
发明人
GUSTAFSON HJALMER C.
分类号
E21B1/30;E21B6/06
主分类号
E21B1/30
代理机构
代理人
主权项
地址
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