| http://www.w3.org/ns/prov#value | - Materials such as PVDF (polyvinylidene fluoride), polyethylene, PTFE (polytetrafluoroethylene), etc, arefor example used, or else copolymers which have the property of crystallyzing directly in a polarizable form.Such sensitive piezoelectric elements are, for example, described in the U.S. Pat. Nos. 4,768,173, 4,810,913, 4,918,666 and 4,984,222, all assigned to the same assignee as the present inv
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