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working machine such as pump or turbine consists of two rotors with the same frequency and same phase difference of 180 degrees; on each rotor are fixed to two identical tubular circuits, each of which, by means of two sets of v
working machine such as pump or turbine consists of two rotors with the same frequency and same phase difference of 180 degrees; on each rotor are fixed to two identical tubular circuits, each of which, by means of two sets of v
