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发明名称
Controlling means for drills
摘要
申请公布号
US1796995(A)
申请公布日期
1931.03.17
申请号
US19280264077
申请日期
1928.03.23
申请人
GARDNER-DENVER COMPANY
发明人
KATTERJOHN AUGUST H.
分类号
E21B21/01
主分类号
E21B21/01
代理机构
代理人
主权项
地址
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