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Pressure wave piezoelectric sensor of continuous structure

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TLDR
In this article, a pressure wave sensor is formed of at least one elongated piezoelectric element having two faces, each associated to a flexible conducting electrode substantially over the whole length of the sensitive element.
Abstract
Pressure wave sensor formed of at least one elongated piezoelectric element having two faces, each associated to a flexible conducting electrode substantially over the whole length of the sensitive element. When the sensor is formed of a plurality of sensitive elements the latter are electrically connected to one another.

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References
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Piezoelectric plastic material and method of making same

TL;DR: In this article, an object of the invention is to provide a solidified plastic material having piezoelectric properties, with particular reference to the use of such material for the generation and reception of electricity.
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TL;DR: In this paper, a sheet or plate of piezoelectric plastic material described in application Serial No. 483,014, filed April 17, 1943, was described as an active element for a submarine signaling device.