| http://www.w3.org/ns/prov#value | - 991; ultrasonic sensing, including methods described in L. C. Lynnworth, Ultrasonic Measurements for Process Control, Academic Press, Boston, 1989, and particularly the method of measuring the delay time for an ultrasonic signal reflected off a solid surface; microwave and radar wave reflectance methods; capacitance methods for determination of distance; eddy current transducer methods; single-cam
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