sealing devices for servicing subterranean wells, namely, metal tubing patches for use in repairing casing in oil and gas wells; manually operated metal valves for preventing blow-out; metal valves for preventing blow-outs, not being parts of machines; metal drill pipes; metal casing for use in oil and gas wells

'blow':28,35 'blow-out':27,34 'case':15,46 'devic':2 'drill':43 'gas':19,52 'machin':41 'manual':21 'metal':8,23,30,42,45 'name':7 'oil':17,50 'oper':22 'out':36 'part':39 'patch':10 'pipe':44 'prevent':26,33 'repair':14 'seal':1 'servic':4 'subterranean':5 'tube':9 'use':12,48 'valv':24,31 'well':6,20,53

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