| http://www.w3.org/ns/prov#value | - Other reference numerals in FIG. 19 are the same as those in FIG. 16. [0179] Substances usable to construct the piezoelectric elements 409 c and 409 c??? are, for example, piezoelectric substances or polycrystals or crystals thereof such as barium titanate, Rochelle salt, quartz crystal, tourmaline, KDP, ADP and lithium niobite; piezoelectric ceramics such as solid solution of PbZrO3 and PbTiO3; o
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