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A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts. The design of .....
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Usually the service life of double metal cylinder liner is about 1500 hours.After that, there will be obvious leaking mud from where groove. Ceramic ....
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Well Drilling Equipment Travelling Block And Hook for Oil well drilling rig with API Description: This travelling block and hook has swivel, which has ...