| http://www.w3.org/ns/prov#value | - This prior art reference discloses an actuator using piezo-electric devices in which the tips of two piezo-electric devices, that are disposed diagonally in such a manner as to cross each other, are connected by a coupling element in a triangular form in such a fashion that the vibration of each piezo-electric device makes the coupling element cause circular or elliptic motion, and this coupling e
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