| http://www.w3.org/ns/prov#value | - A transducer, comprising:a piezoelectric membrane including a laminar sheet composed of a piezoelectric material and a pair of conductive electrodes coating the sheet and sandwiching the sheet between them; said membrane have two surfaces, an edge portion, and a central portion; support means for supporting said membrane and electrically contacting said membrane at the electrodes; said support mea
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