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发明名称
PROCESSO PARA PERFURACAO DA TERRA E APARELHO PARA FAZER UM FURO CILINDRICO NA TERRA
摘要
申请公布号
BR7608508(A)
申请公布日期
1978.07.18
申请号
BR19760008508
申请日期
1976.12.17
申请人
SALISBURY W;STILES W
发明人
SALISBURY W;STILES W
分类号
E21B7/00;(IPC1-7):E21B7/00
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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