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发明名称
PERFECCIONAMIENTOS EN LA CONSTRUCCIËN DE PERFORADORES ROTATORIOS
摘要
申请公布号
ES235284(A1)
申请公布日期
1957.12.16
申请号
ES19840002352
申请日期
1957.05.07
申请人
ETABLISSEMENTS NEYRPIC
发明人
分类号
(IPC1-7):E21
主分类号
(IPC1-7):E21
代理机构
代理人
主权项
地址
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