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Y63 Bottom entry

Y63 Bottom entry with lead sealing

Y63 Bottom entry cut groove with prevent blast hole with plastic surface

Y63 Bottom entry prevent blast holes,inter-fotation with plastic surface

Y63 Bottom entry double prevent blast hole

Y63 Bottom entry cut trough with plastic surface

Y63 Bottom entry cut groove with prevent blast hole with plastic surface

Y63 Bottom entry prevent blast holes, inter-rotation with plastic surface

Y63 Bottom entry prevent blast holes, inter-rotatio with plastic surface