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20-50-80m³/H 3PA Explosion-Proof Clean Corrosion Resistant Oil-Free Air-Cooled Dry Screw Vacuum Pump for PVD/Coating/Pharmaceutical, Find Details and Price about Vacuum Pump Dry Screw Vacuum Pump from 20-50-80m³/H 3PA Explosion-Proof Clean Corrosion Resistant Oil-Free Air-Cooled Dry Screw Vacuum Pump for PVD/Coating/Pharmaceutical - Dongguan Pronotek Vacuum Technology Co., Ltd.