| http://www.w3.org/ns/prov#value | - ctrodes, said circuit including the output of said generator connected in series with the input of said motor; an alternating current generatormechanically connected to said motor for generating an alternating current the frequency of which is a function of the speed of said motor; and an electro-magnetic pulsator in communicationwith the drilling fluid duct in said drill collar, the actuating win
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