| http://www.w3.org/ns/prov#value | - A servo system for controlling the coordinates of a transcranial Doppler ultrasound comprising:a) a levitated rotor means within a housing and including means for directing said Doppler ultrasound; b) means for inducing two-axis tilt movement of said rotor means; c) sensing means for defining coordinates of said rotor means; and d) control means for controlling movement of said rotor means. 28.
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