A dual diaphragm speaker comprising first and second diaphragms operating in accordance with the piezoelectric effect, the diaphragms being arranged to be driven in opposite phase with respect to one another so as to cancel out non-linearities. The speaker is made transparent and mounted over the display panel of a mobile telephone.

 
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< Method and apparatus for reading an array of thermal resistance sensors

< Ear terminal

> Behind-the-ear housing functioning as a switch

> Electrooptic assembly

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