UN METODO PARA LA CONEXION DE CONDUCTOS EN POZOS SUBTERRA- NEOS TALADRADOS.
申请公布号:ES347351(A3)
申请号:ES19510003473
申请日期:1967.11.18
申请公布日期:1969.11.01
分类号:E21D;(IPC1-7):E21D/
主分类号:E21D
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