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发明名称
Rotation mechanism for rock drills
摘要
申请公布号
US1776509(A)
申请公布日期
1930.09.23
申请号
US19280246231
申请日期
1928.01.12
申请人
INGERSOLLRAND COMPANY
发明人
HULSHIZER GEORGE W.
分类号
E21B6/06
主分类号
E21B6/06
代理机构
代理人
主权项
地址
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