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经营范围
发明名称
Planetary gear transmission for drilling apparatus
摘要
申请公布号
US2715344(A)
申请公布日期
1955.08.16
申请号
US19510227047
申请日期
1951.05.18
申请人
ARMAIS ARUTUNOFF
发明人
ARUTUNOFF ARMAIS
分类号
E21B4/04;F16H1/46
主分类号
E21B4/04
代理机构
代理人
主权项
地址
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