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发明名称
APERFEICOAMENTOS EM PERFURATRIZES DA CROSTA TERRESTRE
摘要
申请公布号
BR7701907(A)
申请公布日期
1978.10.10
申请号
BR19770001907
申请日期
1977.03.25
申请人
BARCELLOS D
发明人
BARCELLOS D
分类号
主分类号
代理机构
代理人
主权项
地址
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