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经营范围
发明名称
Underreaming apparatus
摘要
申请公布号
US1868702(A)
申请公布日期
1932.07.26
申请号
US19230652906
申请日期
1923.07.21
申请人
GRANVILLE HOLDING CORPORATION
发明人
GRANVILLE BERNARD
分类号
E21B10/34
主分类号
E21B10/34
代理机构
代理人
主权项
地址
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