| http://www.w3.org/ns/prov#value | - The transducer 18B outputs emitted energy 15. [0008] The precise impedance of the transducer 18B can vary depending on many variables such as the number, size and spacing of substrates 14 in the carrier 12 and the distance between the substrates 14 and the transducer 18B. The precise impedance of the transducer 18B can also vary as the transducer 18B ages through repeated usage.
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