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发明名称
PEDOTENCIOGRAFO
摘要
申请公布号
BR7902498(A)
申请公布日期
1980.11.04
申请号
BR19790002498
申请日期
1979.04.04
申请人
DA SILVA J
发明人
DA SILVA J
分类号
E21B49/02;(IPC1-7):E21B3/12
主分类号
E21B49/02
代理机构
代理人
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地址
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