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0.5M Precision Worm Gear Reducer 1:20/30/40/50/60/70/80/100 PTZ Reducer Turbine Cppper Bearing Parts 0.5M Precision Worm Gear Reducer 1:20/30/40/50/60/70/80/100 PTZ Reducer Turbine Cppper Bearing Parts 0.5M Precision Worm Gear Reducer 1:20/30/40/50/60/70/80/100 PTZ Reducer Turbine Cppper Bearing Parts