| 摘要 |
Shredding apparatus for reducing material by use of cutter discs mounted on each of a pair of spaced shafts which place the cutter discs in an interleaved operating position over a perforated grate which has active surfaces swept by the cutter discs, and a controllable drive for oscillating the grate so the normally inactive surfaces of the grate are also swept by the cutter discs.
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