| 摘要 |
A cutter drum has a sump ring and a plurality of vanes, the exterior surfaces of the sump ring and vanes being substantially smooth. The vanes and sump ring contain holes for receiving cutting bits for cutting material to be mined, the cutting bits being removably mounted in the holes. Retaining blocks are removably mounted in the vanes or sump ring for engaging a base portion of the cutting bit and retaining the cutting bit in the cutting drum.
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