| http://www.w3.org/ns/prov#value | - The piezoelectric vibrating elements are connected at their peripheral ends to each other through connectors, one of the elements being connected at its peripheral edge directly to a cone type acoustic radiator to give the radiator a vibramotive force mainly in a high-frequency portion, and the remaining elements adjacent thereto producing a vibramotive force adapted to share middle- and low-frequ
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