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发明名称
PORTABLE DRILLING RIG ASSEMBLY
摘要
申请公布号
CA600903(A)
申请公布日期
1960.07.05
申请号
CAD600903
申请日期
申请人
BEN W. SEWELL
发明人
BEN W. SEWELL
分类号
主分类号
代理机构
代理人
主权项
地址
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