| http://www.w3.org/ns/prov#value | - The body portion 12 may be formed from materials well known to those of ordinary skill in the art such as piezoceramic material including an active poled piezoelectric material, such as lead zirconate titanate (PZT), polarized in the direction indicated by the arrows 20 in FIGS. 2A, 2B and 2C.
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