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经营范围
发明名称
EARTH BORING MACHINE
摘要
申请公布号
CA929360(A)
申请公布日期
1973.07.03
申请号
CA19700092815
申请日期
1970.09.10
申请人
RICHMOND MANUFACTURING CO
发明人
RICHMOND A
分类号
E21B7/20;E21B19/086
主分类号
E21B7/20
代理机构
代理人
主权项
地址
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