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MECHANICAL DRILLING RIG for Drilling Depth of 1500-7000 Meters MECHANICAL DRILLING RIG for Drilling Depth of 1500-7000 Meters two-way electric valve CWX-20P for fluid control syestems two-way electric valve CWX-20P for fluid control syestems Model SEM-1 Electromagnetic Flowmeter Model SEM-1 Electromagnetic Flowmeter YDDZ TYPE SERIES FEEDBACK HYDRAULIC ELEVATORS YDDZ TYPE SERIES FEEDBACK HYDRAULIC ELEVATORS Cast Check Valve Cast Check Valve
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