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Brief description of the drawings
1 is a front and back view showing the piezoelectric material according to the present invention
in an expanded state, FIG. 2 is a side view showing a state in which the one in FIG. FIGS. 4 and 5
are front and back views of a piezoelectric sheet showing another example of the electrode
shape. 1.2 ... piezoelectric material, 3, 4 ... surface, 5, 6 ... back surface, 7-13 ... electrode.