HARDENABLE FILLING FOR COPPER ORE MINES

申请公布号：PL140324(B2)

申请号：PL19840250982

申请日期：1984.12.07

申请公布日期：1987.04.30

分类号：E21F;E21F15/02;(IPC1-7):E21F15/02

主分类号：E21F

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