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Hqd70 Down The Hole Hammer Rock Drill Rig Blast Drilling Rig for Mining. Hydraulic Technology: Energy saving and efficiency with stable structure design. Patent Hydraulic Station: Mercury split type design reduces labor intensity and weight. Versatile Operation: Good detachability suitable for various original landforms. 24/7 Support: After-sales service available in different languages around the clock. Spare Parts Availability: Original spare parts available from central stocks with proven quality. Technical Training: Training provided at partner factories or working sites by experts. Custom Voltage: Voltage can be customized according to specific requirements. OEM Orders Welcome: Professional design team supports custom OEM orders.