| http://www.w3.org/ns/prov#value | - a means including a piezoelectric element which is fixed to the diaphragm, and an electrode provided on a single or both surfaces of the piezoelectric element so as to apply an electric field to the piezoelectric element, the single or both surfaces of the piezoelectric element being grooved so as to divide the electrode into electrodes which correspond to the individual ink passages.
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