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发明名称
PERFECCIONAMIENTOS INTRODUCIDOS EN UNA TUBERIA DE DESAGUE RECUBIERTA.
摘要
申请公布号
ES443623(A1)
申请公布日期
1977.05.01
申请号
ES19230004436
申请日期
1975.12.18
申请人
POLVA NEDERLAND, B. V.
发明人
分类号
F16L9/12;E02B11/00;F16L11/12;(IPC1-7):02B/
主分类号
F16L9/12
代理机构
代理人
主权项
地址
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