| http://www.w3.org/ns/prov#value | - Referring now to the drawings, in which like reference numerals are used to refer to the same or similar elements, FIG. 1 shows an example of an acoustic-electric channel through a barrier 10 for transmitting signals through solid or other media, with an electroacoustic transducer 12 and 14 on each side of the barrier 10.
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