| http://www.w3.org/ns/prov#value | - In the vibratory unit 1 having such a construction as described above, when a drive current for a rectangular pulse flows to the coil 8, the protruding end 11 a of the columnar plunger 11 and the protrusion 14 b formed on the bottom wall 14 a of the second yoke segment 14 have mutually different magnetic polarities (the N polarity or the S polarity) and pull each other against the urging force of
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