Sealing devices for shafts, valves, pressurized vessels, pipe connections and other industrial apparatus, namely, non-metal seals for use in the fields of upstream and downstream oil industry, mining, construction, dredging and other sub-surface applications

'apparatus':13 'applic':38 'connect':9 'construct':31 'devic':2 'downstream':27 'dredg':32 'field':23 'industri':12,29 'metal':17 'mine':30 'name':14 'non':16 'non-met':15 'oil':28 'pipe':8 'pressur':6 'seal':1,18 'shaft':4 'sub':36 'sub-surfac':35 'surfac':37 'upstream':25 'use':20 'valv':5 'vessel':7

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