Downhole, power-operated and non-power-operated well drilling tools being parts of drilling machines, namely, torsional oscillation reducers made of rubber composition, rubber-like composition, plastic composition, or such compositions combined with metal, namely, rotors, stators, helical splines, and other such mechanisms used in transferring and generating changes to torque and rotation for protecting and improving durability to a drill bit during drilling

'bit':65 'chang':52 'combin':35 'composit':25,29,31,34 'downhol':1 'drill':11,16,64,67 'durabl':61 'generat':51 'helic':41 'improv':60 'like':28 'machin':17 'made':22 'mechan':46 'metal':37 'name':18,38 'non':7 'non-power-oper':6 'oper':4,9 'oscil':20 'part':14 'plastic':30 'power':3,8 'power-oper':2 'protect':58 'reduc':21 'rotat':56 'rotor':39 'rubber':24,27 'rubber-lik':26 'spline':42 'stator':40 'tool':12 'torqu':54 'torsion':19 'transfer':49 'use':47 'well':10

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