| http://www.w3.org/ns/prov#value | - er arrays or transducers being such as to act as transmitters and receivers of shear waves on said substrate, d. a pulsed source of energy connected to said transducers for generating shear wave on the substrate, and e. receiver and timing means connected to the transducers for detecting and timing reflected energy pulses such that the position of a human finger or other passive stylus placed on t
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