RB777C jack hammer 1.My company has product patent right ... 2.compact the gravel backfilled in the highway constr RB777C jack hammerMy company has product patent right for this model ... .Instruction RB777C Tamping Rammer is Used to compact the gravel backfilled ... frequency18.3 HzAir consumption34L/SAir inner Dia.19mmOil Capacity30ml RB777C jack hammer
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