Metal downhole communications units comprising annular inductive couplers for connecting linking tubular components, namely, drill pipes, drill collars, drill bits, jars, motors, hammers, turbines and other downhole tools

'annular':6 'bit':20 'collar':18 'communic':3 'compon':13 'compris':5 'connect':10 'coupler':8 'downhol':2,27 'drill':15,17,19 'hammer':23 'induct':7 'jar':21 'link':11 'metal':1 'motor':22 'name':14 'pipe':16 'tool':28 'tubular':12 'turbin':24 'unit':4

Non-metal downhole communications units comprising annular inductive couplers for connecting linking tubular components, namely, drill pipes, drill collars, drill bits, jars, motors, hammers, turbines and other downhole tools

'annular':8 'bit':22 'collar':20 'communic':5 'compon':15 'compris':7 'connect':12 'coupler':10 'downhol':4,29 'drill':17,19,21 'hammer':25 'induct':9 'jar':23 'link':13 'metal':3 'motor':24 'name':16 'non':2 'non-met':1 'pipe':18 'tool':30 'tubular':14 'turbin':26 'unit':6

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